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10 Common Causes of Excessive Oil Consumption in Diesel Engines

Diesel engines are built for durability, but excessive oil consumption can quickly turn into a costly repair if the root cause is ignored.

If you’re constantly adding oil, noticing blue or gray smoke, or seeing a drop in performance, there’s usually an underlying mechanical reason. The key is figuring out whether the oil is being burned, leaked, pushed through the intake system, or lost because of internal engine wear.

In this guide, we’ll break down the most common causes of excessive oil consumption in diesel engines, what each one means, and what to check before it turns into a major failure.

Continue reading 10 Common Causes of Excessive Oil Consumption in Diesel Engines
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Cummins ISX Fuel Injector Problems: Symptoms, Causes, and Replacement Guide

If your Cummins ISX is hard starting, losing power, or producing excessive smoke, failing fuel injectors could be the cause.

Injector issues don’t usually show up all at once.

They start small, but if ignored, they can quickly turn into major engine problems.

Understanding the symptoms – and addressing them early – can save you time, money, and downtime.

Continue reading Cummins ISX Fuel Injector Problems: Symptoms, Causes, and Replacement Guide
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Who Is the Black Series Actually For?

Most diesel engine components are marketed the same way.

They’re advertised as the best solution for every truck, every fleet, every rebuild, and every application.

The problem is that real-world diesel engines do not all operate under the same conditions.

A long-haul owner-operator running hundreds of thousands of highway miles has different priorities than a local delivery fleet. A repair shop performing commercial overhauls has different concerns than someone chasing maximum horsepower.

Black Series was not designed to be a one-size-fits-all product line. In fact, the Black Series is not for everyone.

The better question is: Who was it actually designed for?


Not Every Diesel Engine Has the Same Job

Heavy-duty diesel engines live very different lives.

Some spend their careers pulling loads across the country.

Others spend their days making short trips, sitting in traffic, and starting cold multiple times per day.

Some engines are rebuilt by repair shops whose reputation depends on every overhaul performing exactly as expected.

When operating conditions change, the stresses placed on engine components change as well.

That means the ideal solution for one customer may not be the ideal solution for another.

The Black Series was developed around one specific goal: Long-term durability and reliability in demanding commercial diesel applications.

The Same Engine Can Live Very Different Lives

A long-haul truck, local delivery vehicle, vocational truck, and performance build may all use similar engine platforms—but their operating conditions, maintenance requirements, and component priorities can be completely different.


The High-Mileage Owner-Operator

If you’re planning to keep your truck for the long haul, Black Series was built with you in mind.

Many owner-operators are not looking for the highest horsepower number possible.

They’re looking for:

  • Consistent performance
  • Long component life
  • Reduced downtime
  • Fewer unexpected repairs
  • Better long-term value

For these operators, engine components are an investment.

Every repair decision impacts future operating costs, maintenance expenses, and vehicle availability.

The Black Series focuses on durability enhancements and component consistency designed to support long service intervals and dependable operation.

Good Fit: Owner-operators planning to keep their truck for hundreds of thousands of miles and prioritizing long-term reliability over maximum horsepower.

The Fleet Fighting Downtime

Fleet operators face a different challenge.

Many delivery and vocational fleets experience:

  • Frequent cold starts
  • Stop-and-go operation
  • Repeated thermal cycling
  • Long idle periods
  • High annual mileage

These operating conditions place significant stress on engine components.

For fleets, a truck sitting in a repair bay is often more expensive than the replacement part itself.

The Black Series was engineered to support the kinds of operating environments where uptime matters and component durability directly affects operating costs.


The Repair Shop Protecting Its Reputation

Repair facilities often face a challenge that many truck owners never see.

When a component fails, the repair shop may be the first phone call the customer makes.

That means every overhaul carries risk.

A comeback does not just cost labor: it affects customer confidence, future business, and reputation.

That is why many repair facilities prioritize consistency and repeatable results.

Black Series components were developed for customers who value predictable performance and application-specific reliability.

Black Series Philosophy

The goal is not to build a component for every possible application. The goal is to engineer components that perform consistently in the environments they were specifically designed to support.


Who Is Black Series NOT For?

This may be the most important part of the conversation.

If your primary goal is building the highest horsepower truck possible, Black Series may not be the solution you’re looking for.

Performance-focused applications often prioritize:

  • Maximum fueling
  • Elevated cylinder pressures
  • Competition use
  • Extreme performance targets

Those applications introduce operating conditions that differ significantly from the commercial environments Black Series was engineered to support.

That does not make one approach better than the other.

It simply means different goals require different engineering decisions.

Black Series was designed around reliability, longevity, consistency, and uptime—not maximum horsepower.


Why Application Matters More Than Marketing

One of the most common mistakes in the diesel industry is selecting parts based on marketing claims instead of operating conditions.

Before selecting any major engine component, ask:

  • How is the truck actually used?
  • How long will it be kept?
  • What does downtime cost?
  • Is reliability more important than horsepower?
  • Is this a work truck or a performance build?

The answers often point toward the correct solution.


Caterpillar C15 Premium Stage 4 Black Series Cylinder Head

Caterpillar C15 Premium Stage 4 Black Series Cylinder Head

HHP Price
$4,997.15

Designed to support combustion sealing stability, thermal stability, casting integrity, and long-term durability in high-load diesel environments.

View Product
C15 ACERT 3406E Black Series Cylinder Head

Caterpillar C15 ACERT, 3406E Black Series Cylinder Head

HHP Price
$4,340.13

Engineered for durability, thermal stability, and long-term sealing performance in severe-duty diesel applications.

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Black Series Oil Pump for Caterpillar C15 ACERT 3406E

Caterpillar C15 Acert, 3406E Black Series Oil Pump

HHP Price
$661.94

Designed to support lubrication stability and oil delivery consistency in high-load diesel engine environments.

View Product

Talk to an Engineer Before You Decide

The best component is not always the most expensive one.

In addition, it is not always the highest-performance option either.

The best component is the one that matches the application’s actual operating environment.

That is why Highway and Heavy Parts takes an application-based approach to recommendations rather than assuming every customer needs the same solution.

Whether you’re managing a fleet, rebuilding a work truck, or planning a long-term overhaul, understanding the duty cycle is the first step toward selecting the right components.


Final Takeaway

The Black Series was never intended to be a universal solution for every diesel application.

It was engineered for owner-operators focused on longevity, fleets focused on uptime, and repair facilities focused on delivering reliable, repeatable results.

If your goal is long-term durability, consistent performance, and reduced downtime, Black Series may be exactly what you’re looking for.

Is Black Series Right for You?

✓ You prioritize reliability over maximum horsepower

✓ Downtime costs you money

✓ You plan to keep the truck long-term

✓ You want consistent performance over extended service intervals

✓ You view engine components as long-term investments

Talk to one of our ASE-Certified Reps if you’re unsure whether Black Series is the right fit for your application.

Call 844-304-7688 or visit highwayandheavyparts.com/black-series to discuss your application with our team.

From diagnosis through delivery, we’re Highway and Heavy Parts.

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Why Stop-and-Go Driving Is Hard on a Diesel Engine

Stop-and-go driving is one of the hardest operating conditions for a diesel engine.

A diesel engine is designed to run under load, reach stable operating temperature, and maintain consistent combustion conditions. In stop-and-go traffic, that rarely happens.

Instead, the engine repeatedly moves through:

  • Idle time
  • Short acceleration events
  • Low-speed operation
  • Heat buildup
  • Frequent temperature changes

Over time, this can increase wear, reduce efficiency, and shorten the life of critical components

Continue reading Why Stop-and-Go Driving Is Hard on a Diesel Engine
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Caterpillar C15 and 3406E Oil Cooler: How It Works, Failure Symptoms, and Why It Matters

The oil cooler on a Caterpillar C15 or 3406E does more than regulate temperature.

It protects:

  • Oil Viscosity
  • Bearing Life
  • Internal Engine Clearances

If the oil cooler fails, it doesn’t just affect oil temperature.

It affects the entire engine.

Continue reading Caterpillar C15 and 3406E Oil Cooler: How It Works, Failure Symptoms, and Why It Matters
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MLS vs. Graphite Head Gaskets: What’s the Real Difference (and Which Should You Use)?

When it comes to sealing a diesel engine, your head gasket isn’t just another component: it’s one of the most critical sealing surfaces in the entire engine.

And choosing the wrong type? That can mean compression loss, coolant leaks, or even a full teardown.

Two of the most common options are:

  • Multi-Layer Steel (MLS) Head Gaskets
  • Graphite (Composite) Head Gaskets

They may serve the same purpose – but they behave very differently under real engine conditions.

Continue reading MLS vs. Graphite Head Gaskets: What’s the Real Difference (and Which Should You Use)?
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How to Replace a Camshaft on a Caterpillar C15 (Step-by-Step Guide)

The camshaft plays a critical role in how your engine runs.

On a Caterpillar C15 diesel engine, even minor camshaft wear can affect:

  • Valve timing
  • Fuel delivery performance
  • Overall engine efficiency

👉 If the camshaft fails, it can lead to serious internal engine damage.

A Caterpillar C15 camshaft replacement is not a small job. It requires proper timing, precision, and a clear understanding of the engine’s setup.

Camshaft reconditioning process

Signs of a Bad Camshaft

Before a Caterpillar C15 camshaft replacement, it’s important to confirm the failure.

Before jumping into a full replacement, it’s important to confirm the camshaft is actually the issue.

👉 If you’re not sure yet, this guide breaks down the symptoms and failure causes in detail:
Caterpillar C15, 3406E Camshaft Guide

Common symptoms include:

  • Loss Of Power Under Load
  • Rough Idle Or Engine Stalling
  • Excessive Engine Noise (Knocking Or Ticking)
  • Reduced Fuel Economy
  • Hard Starting Or No Start Condition

Even small wear can affect performance.

👉 As little as .001″ wear can change valve timing by several degrees, impacting how the engine runs.


What Causes Camshaft Failure on a C15

Camshaft failure is rarely random.

Most failures are caused by:

  • Poor Lubrication (Oil Issues)
  • Contaminated Engine Oil
  • Worn Rollers Or Lifters
  • Improper Installation From Previous Repairs

👉 Before installing a new camshaft, always identify the root cause to prevent repeat failure.


How to Replace a Caterpillar C15 Camshaft

This is a high-level process. Exact procedures may vary depending on your engine configuration.


1. Preparation

  • Disconnect batteries
  • Drain engine oil
  • Remove valve covers
  • Inspect visible valvetrain components

2. Set Engine to Top Dead Center (TDC)

Rotate the engine and lock it at Top Dead Center (TDC).

  • Use a timing pin to secure the flywheel
  • This ensures proper timing during reassembly

👉 This step is critical – incorrect timing can cause engine damage.


3. Remove Front Timing Components

  • Remove the front timing cover (“peanut cover”)
  • Gain access to the cam gear

4. Remove the Cam Gear

  • Use a proper gear puller or removal tool
  • Carefully remove the cam gear without damaging surrounding components

5. Remove Rocker Assemblies

  • Remove rocker arms and shaft assemblies
  • Keep components organized for reinstallation

6. Remove the Camshaft

  • Carefully slide the camshaft out
  • Avoid damaging cam bearings during removal

👉 This is where many installs go wrong – any scoring or damage can lead to premature failure.


7. Inspect and Replace Bearings

  • Always install new camshaft bearings
  • Inspect for wear, scoring, or oiling issues

8. Install the New Camshaft

  • Lubricate bearings and camshaft thoroughly
  • Carefully slide the new camshaft into place

9. Reinstall Components and Set Timing

  • Reinstall cam gear
  • Align timing marks correctly (typically 12 o’clock alignment)
  • Install retainer plate and torque bolts properly

👉 Camshaft bolt torque: ~180 ft-lbs (verify per spec)


10. Final Assembly

  • Reinstall rocker assemblies
  • Set valve lash to specification
  • Reinstall timing cover and remaining components

Important Installation Tips

When replacing a camshaft on a C15, pay attention to:

  • Always Verify Fitment Using ESN
  • Replace Bearings and Related Components
  • Keep All Components Clean
  • Follow Torque Specifications Exactly
  • Double-Check Timing Alignment

👉 One mistake here can lead to complete engine failure.


Why Camshaft Installs Fail (And How to Prevent It)

Most repeat failures are caused by:

  • Reusing worn components
  • Improper timing alignment
  • Skipping bearing replacement
  • Not addressing oil system issues

👉 A camshaft replacement is not just a part swap – it’s a system repair.


At Highway and Heavy Parts, we help you identify the problem and get the right parts the first time.

Call 844-304-7688 or visit highwayandheavyparts.com to place your order today.

From diagnosis through delivery, we’re Highway and Heavy Parts.

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7 Common Detroit Diesel Series 60 Problems

Do you have a Series 60 engine from Detroit? For the most part, it probably runs great for you. This electronically controlled engine has a favorable history, shared between all three versions, and despite having been out of production for years now, it remains a popular choice for many operators.

Continue reading 7 Common Detroit Diesel Series 60 Problems
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Precision Machining Explained: Why It Matters for Diesel Engine Parts

When you open a diesel engine, it’s easy to focus on the big components—pistons, crankshafts, cylinder heads, and turbochargers.

What you can’t see is often just as important.

Modern diesel engines rely on components manufactured to incredibly tight tolerances. In many cases, a difference of just a few thousandths of an inch can affect oil pressure, compression, bearing life, piston ring sealing, and overall engine reliability.

That’s where precision machining comes in.

Precision machining is the process of manufacturing engine components to extremely accurate dimensions, shapes, and surface finishes. While it may not be the most visible part of the manufacturing process, it’s one of the biggest reasons quality diesel engine parts last hundreds of thousands of miles.

In this article, we’ll explain what precision machining is, why it matters, and how it affects the performance and longevity of your diesel engine.

Quick Takeaway: Precision machining isn’t about making parts look perfect—it’s about making them fit, seal, and operate exactly as the engine designer intended. Even tiny dimensional differences can affect compression, oil pressure, bearing life, and overall engine durability.

Continue reading Precision Machining Explained: Why It Matters for Diesel Engine Parts
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Cummins ISX15 Camshaft and Crankshaft Misalignment Code 0731 After Overhaul

If you’re working on a Cummins ISX15 and run into fault code 0731 (camshaft and crankshaft misalignment) after an overhaul, it can be frustrating.

Especially when:

  • The engine runs smooth
  • Timing appears correct
  • The crank pins correctly
  • The cam wedges properly
  • Sensors and tone wheel check out

👉 Yet the code is still active.

Continue reading Cummins ISX15 Camshaft and Crankshaft Misalignment Code 0731 After Overhaul
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Cylinder Head Porting Explained: Does It Really Improve Diesel Engine Performance?

If you’ve spent any time around engine builders or performance enthusiasts, you’ve probably heard someone mention “porting the cylinder head.” Some swear it’s one of the best performance upgrades you can make. Others say it’s an expensive way to ruin a perfectly good cylinder head.

So what’s the truth?

Like many things in engine building, the answer depends on the application.

Cylinder head porting can improve airflow and increase engine performance when it’s done correctly. However, it’s far more than simply making the ports larger. In fact, removing too much material can actually reduce airflow, hurt performance, or permanently damage the cylinder head.

Whether you’re rebuilding a heavy-duty diesel engine or simply curious about how cylinder heads work, understanding the basics of porting can help you make more informed decisions.

Quick Takeaway: Cylinder head porting improves airflow by carefully reshaping the intake and exhaust ports—not simply making them larger. Done correctly, it can improve airflow efficiency and support higher horsepower. Done incorrectly, it can reduce performance or permanently damage the cylinder head.
Continue reading Cylinder Head Porting Explained: Does It Really Improve Diesel Engine Performance?
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Diesel Turbocharger Sounds: What They Mean and When to Inspect

A diesel turbocharger is not silent.

A light whistle, whoosh, or spool sound under load can be completely normal. However, when the sound changes suddenly, gets louder, or comes with smoke, low power, or oil consumption, it can point to a problem in the turbocharger system.

The key is not just hearing the sound.

It is understanding what kind of sound it is, when it happens, and what else the engine is doing at the same time.

Turbocharger noise can come from the turbo itself, but it can also come from boost leaks, exhaust leaks, restricted air filters, fuel system problems, damaged exhaust components, or lubrication issues. Garrett specifically notes that noisy performance, low power, smoke, and oil consumption can come from underlying engine problems—not always the turbocharger itself.

Continue reading Diesel Turbocharger Sounds: What They Mean and When to Inspect