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Posted on September 15, 2025June 8, 2026 by Caitlyn Vance

Diesel Prices Around the World in June 2026

If you run trucks, manage repairs, or budget for diesel work, fuel price changes matter fast.

As of June 01, 2026, the global average retail diesel price was $1.56 per liter, or $5.91 per gallon, according to GlobalPetrolPrices. Their dataset notes that some countries are updated weekly and others monthly, depending on how their fuel markets are regulated.

What stands out most is not just the average. It’s the spread.

On the low end, a few heavily subsidized or regulated markets were still posting diesel prices near zero in U.S. dollar terms. On the high end, some developed markets were above $2.50 per liter, with Hong Kong above $4.50 per liter.

Posted on September 15, 2025May 21, 2026 by Caitlyn Vance

Camshaft Failure Analysis: What Causes Excessive Lobe Wear (C15 Focus Included)

We all know how important camshafts are to engine performance – and when they fail, the damage can go far beyond the camshaft itself.

Whether you’re running a general diesel platform or a Caterpillar C15 diesel engine, one of the most common issues is camshaft lobe wear and pitting.

👉 And once it starts, it does not slow down – it accelerates.

Posted on September 15, 2025June 25, 2026 by David Ley

Black Series Lab Episode 3: Crosshatch — The Surface You’ve Never Actually Seen

Most engine rebuild conversations focus on the parts everyone can see.

Pistons. Rings. Bearings. Cylinder heads. Gaskets. Liners.

But one of the most important surfaces in the entire engine is almost invisible once the rebuild is complete.

The cylinder liner crosshatch.

That microscopic pattern machined into the cylinder wall plays a major role in oil retention, piston ring seating, compression control, blow-by prevention, and long-term engine durability.

In Black Series Lab Episode 3, we look closer at that surface and explain why the liner wall is not just a smooth bore. It is an engineered sealing surface.

Quick Takeaway: Crosshatch is not just a machining mark. It is a controlled surface pattern designed to retain oil, support ring seating, and help the engine maintain compression and oil control after a rebuild.

Posted on September 15, 2025July 2, 2026 by David Ley

How to Build a Strong Reputation as a Diesel Repair Shop

In the diesel industry, reputation matters more than almost anything else.

A fleet manager may forget your advertising.
A customer may forget your pricing.
But they will absolutely remember whether the truck was fixed correctly the first time.

In heavy-duty repair, reputation is built through consistency, communication, turnaround time, and technical accuracy – not flashy marketing.

Most successful diesel shops grow the same way:

Good work
Honest communication
Repeat customers
Word-of-mouth referrals

Learning how to build a reputation as a diesel shop takes time, especially in industries where word-of-mouth referrals spread quickly between fleets, drivers, and owner-operators.

In fact, many shop owners and fleet managers agree on one thing:

👉 If you do good work, people talk.
👉 If you do bad work, people talk even faster.

That is especially true in trucking, construction, agriculture, and fleet operations where companies constantly share recommendations between shops, drivers, and technicians.

Posted on September 15, 2025July 10, 2026 by David Ley

Do You Need School to Become a Diesel Mechanic?

If you’re thinking about becoming a diesel mechanic, you’ve probably asked one of the most common questions in the industry: Do I need to go to school, or can I learn on the job?

The short answer is: Both paths can lead to a successful career.

Some diesel technicians attend a trade school before ever stepping into a shop. Others start changing oil, performing preventive maintenance (PMs), mounting tires, or cleaning the shop and work their way into full technician positions.

Neither path is automatically better than the other.

What matters most is building technical knowledge, gaining hands-on experience, and continuously learning throughout your career.

HHP Quick Answer

Most employers expect diesel technicians to have a high school diploma or GED. From there, many technicians either attend a diesel technology program or begin working in an entry-level shop position while learning from experienced mechanics. The best long-term careers often combine classroom education with hands-on experience.

Posted on September 15, 2025July 2, 2026 by Caitlyn Vance

Oil Change Intervals After Diesel Engine Break-In

A diesel engine rebuild is not finished the moment the engine starts.

Even after the first startup and initial break-in procedure, the internal components are still seating, wearing in, and establishing the final sealing surfaces that help the engine build compression, control oil, and operate reliably.

That is why oil changes during the break-in period matter.

Fresh oil helps protect the engine, but early oil changes help remove assembly debris, break-in particles, and microscopic metal from new contact surfaces before they circulate through bearings, turbochargers, piston rings, and other critical components.

The exact break-in procedure and oil change schedule should always follow the engine builder’s or manufacturer’s recommendation. However, for many rebuilt heavy-duty diesel engines, an early oil and filter change is still one of the best ways to protect the investment you just made.

HHP Quick Takeaway

After a diesel engine rebuild, oil changes should be more frequent during the break-in period. A first oil and filter change around the first 500 miles is a common best practice because it helps remove assembly debris and break-in wear particles before they can contribute to premature engine wear.

Posted on September 15, 2025June 30, 2026 by Caitlyn Vance

What Is a 48-Volt Heated Aftertreatment System?

The diesel industry is entering another major emissions transition.

Beginning with EPA 2027 heavy-duty emissions regulations, diesel engines will face some of the strictest nitrogen oxide ( $NO_x$ ) standards ever introduced for commercial vehicles.

One of the biggest technologies helping manufacturers meet these standards is the 48-volt heated aftertreatment system.

This system is designed to:

Heat emissions components faster
Reduce cold-start emissions
Maintain catalyst temperature during low-load operation
Dramatically reduce $NO_x$ output

Modern diesel engines already rely heavily on aftertreatment systems.

However, EPA 2027 standards require emissions systems to become even more effective during:

Cold starts
Idling
Low-load operation
Urban stop-and-go driving

That is where heated aftertreatment systems become important.

Posted on September 15, 2025June 30, 2026 by Caitlyn Vance

Diesel Problems That Only Show Up Under High Load

Some diesel engine problems only appear when the engine is working hard. A truck may:

Idle perfectly
Start normally
Drive fine empty

…but suddenly lose power while:

Pulling a trailer
Climbing a grade
Accelerating under load
Hauling heavy weight

This happens because high-load conditions place maximum demand on:

Fuel delivery
Airflow
Turbocharger performance
Cooling systems
Exhaust flow
Combustion efficiency

Under light driving conditions, weak components can sometimes “hide.” However, when engine demand increases, those weaknesses often become obvious very quickly.

Posted on September 15, 2025June 30, 2026 by Caitlyn Vance

What Is Day-to-Day Life Really Like as a Diesel Mechanic?

A lot of people are interested in becoming diesel mechanics because they:

Love trucks and equipment
Enjoy working with their hands
Want a stable career
Like problem-solving
Want to avoid sitting behind a desk all day

However, many people only see one side of the industry. They see:

Big trucks
Toolboxes
Engine rebuilds
Cool diagnostic equipment

…but they do not always see the reality of the day-to-day work.

Posted on September 15, 2025June 29, 2026 by Caitlyn Vance

Essential KPIs Every Diesel Repair Shop Should Track

Many diesel repair shops focus heavily on:

Labor hours
Truck count
Parts sales
Monthly revenue

However, the strongest shops usually track much deeper operational data.

Why? Because profitability problems rarely appear overnight.

Most issues start as:

Low technician efficiency
Weak parts margins
Poor workflow
Excessive downtime
Low billed hours
Comebacks and repeat repairs

Tracking the right diesel repair shop KPIs helps identify these issues before they become major financial problems.

Instead of waiting until the end of the month to see whether the shop made money, many successful diesel repair shops monitor key performance indicators weekly.

That allows owners and managers to:

Forecast revenue
Improve workflow
Increase profitability
Reduce inefficiencies
Identify bottlenecks quickly

What Is a KPI?

A KPI (Key Performance Indicator) is a measurable metric used to track business performance.

In a diesel repair shop, KPIs help measure:

Productivity
Profitability
Efficiency
Repair quality
Workflow performance

Good KPI tracking turns shop management into a data-driven process instead of guesswork.

Effective Labor Rate (ELR)

One of the most important diesel repair shop KPIs is Effective Labor Rate (ELR).

ELR measures:
👉 What the shop actually collects per billed labor hour.

Why ELR Matters

Many shops focus only on their posted labor rate.

However:

Discounts
Warranty work
Unbilled diagnostics
Inefficient workflow
Missed billed hours

…can significantly reduce the actual collected labor revenue.

ELR Formula

Effective Labor Rate is commonly calculated as:

$ELR = \frac{\text{Total Labor Sales}}{\text{Total Billed Hours}}$ ELR=Total Billed HoursTotal Labor Sales

What ELR Can Reveal

A low ELR may indicate:

Undercharging labor
Too much non-billable time
Weak estimating practices
Excessive discounting
Workflow inefficiencies

Strong ELR tracking helps shops understand what they are truly earning: not just what they charge on paper.

Technician Efficiency

This measures how many billable hours a technician produces compared to paid hours.

Technician Efficiency Formula

$\text{Technician Efficiency} = \frac{\text{Billed Hours}}{\text{Paid Hours}} \times 100$ Technician Efficiency=Paid HoursBilled Hours×100

Why Technician Efficiency Matters

Efficiency helps determine:

Technician productivity
Workflow effectiveness
Bay utilization
Labor profitability

For example:

A technician paid for 40 hours who bills 50 hours is operating at 125% efficiency.

Low efficiency may indicate:

Poor workflow
Waiting on approvals
Delayed parts
Weak diagnostics
Excessive downtime between jobs

Technician Productivity

Efficiency and productivity are not the same thing.

Productivity measures:
👉 How much time technicians actually spend working on vehicles.

A technician may be efficient while still losing productivity because of:

Waiting on parts
Delayed dispatching
Poor scheduling
Administrative interruptions

Strong shops track both efficiency and productivity together.

Repair Order Count (RO Count)

RO Count measures:
👉 How many repair orders the shop closes during a specific period.

This KPI helps monitor:

Shop throughput
Workflow volume
Capacity utilization

A sudden drop in RO count may indicate:

Slower workflow
Customer retention problems
Scheduling inefficiencies
Seasonal slowdown

Average Repair Order (ARO)

Average Repair Order measures:
👉 The average revenue generated per repair order.

ARO Formula

$ARO = \frac{\text{Total Revenue}}{\text{Total Repair Orders}}$ ARO=Total Repair Orders Total Revenue

Why ARO Matters

A low ARO may indicate:

Missed inspections
Weak upselling
Poor diagnostic depth
Minimal preventative maintenance recommendations

A strong ARO usually reflects:

Thorough inspections
Better communication
More complete repairs
Better preventative maintenance opportunities

Parts Margins Matter More Than Many Shops Realize

One of the most overlooked diesel repair shop KPIs is parts margin.

Many shops focus heavily on labor profitability while ignoring:

Parts markup consistency
Inventory losses
Supplier pricing changes
Warranty write-offs
Excessive discounting

However, parts sales often represent a major portion of total shop revenue.

Why Parts Margins Are Important

Weak parts margins can quietly destroy profitability.

Common causes include:

Inconsistent markup policies
Incorrect pricing matrices
Excessive warranty dependence
Inventory shrinkage
Emergency purchasing
Supplier price fluctuations

Strong shops closely monitor:

Gross profit margin on parts
Average parts sales per RO
Inventory turns
Parts obsolescence

Average Parts per RO (ARPO)

ARPO measures:
👉 Average parts revenue generated per repair order.

ARPO Formula

$ARPO = \frac{\text{Total Parts Sales}}{\text{Repair Orders}}$

Why ARPO Matters

Low ARPO may indicate:

Incomplete inspections
Missed repair opportunities
Weak preventative maintenance recommendations

Strong ARPO numbers often reflect:

Better inspections
More complete repairs
Higher-quality repair planning

Comeback Rate

Comeback rate measures:
👉 How often vehicles return for the same repair issue.

This is one of the most important quality-control KPIs in any diesel repair shop.

Why Comeback Rate Matters

Comebacks damage:

Profitability
Shop efficiency
Customer trust
Technician morale
Reputation

Repeat repairs also increase:

Unpaid labor time
Scheduling disruptions
Fleet downtime

Strong diesel repair shops focus heavily on:

Root-cause diagnostics
Verification testing
Accurate repair procedures

…to minimize comeback rates.

Repair Turnaround Time

Turnaround time tracks:
👉 How long trucks remain in the shop from arrival to completion.

This KPI is especially important for:

Fleet customers
Owner-operators
High-utilization trucks

Long turnaround times may result from:

Parts delays
Poor workflow
Scheduling inefficiencies
Diagnostic bottlenecks

Dwell Time

Dwell time measures:
👉 How long a truck sits before work actually begins.

A truck sitting idle in the yard generates:

No revenue
No progress
Customer frustration

Reducing dwell time often improves:

Throughput
Bay utilization
Customer satisfaction

Gross Profit Margin

Gross profit margin helps determine:
👉 How much profit remains after direct costs are removed.

Strong shops monitor:

Labor gross profit
Parts gross profit
Total gross margin

Tracking gross profit helps shops identify:

Pricing problems
Cost increases
Margin erosion

Inventory Turns

Inventory turns measure:
👉 How often inventory is sold and replenished.

Slow-moving inventory ties up:

Cash flow
Storage space
Purchasing flexibility

Strong inventory management helps reduce:

Obsolete inventory
Overstocking
Emergency purchasing

Weekly KPI Tracking Is More Effective Than Monthly Tracking

Many successful shops review KPIs weekly instead of monthly.

Weekly tracking allows shops to identify:

Workflow problems
Revenue gaps
Technician inefficiencies
Margin declines

…before they become larger operational issues.

How Revenue Is Often Forecasted

Many diesel repair shops use KPIs together to forecast revenue.

Labor revenue commonly depends on:

Effective labor rate
Technician efficiency
Total paid hours

Parts revenue commonly depends on:

Average parts sales per RO
Repair order count

Tracking these numbers weekly helps shops predict:

Revenue trends
Staffing needs
Workflow bottlenecks

Strong KPI Tracking Improves More Than Profit

Good KPI tracking also improves:

Customer experience
Turnaround time
Repair quality
Technician accountability
Shop organization

The goal is not simply increasing numbers.

The goal is building:

Consistency
Efficiency
Sustainable profitability

Final Takeaway

The best diesel repair shops do not rely on guesswork.

They track KPIs consistently to understand:

Profitability
Efficiency
Workflow performance
Repair quality
Parts margins

Some of the most important diesel repair shop KPIs include:

Effective Labor Rate (ELR)
Technician Efficiency
Average Repair Order (ARO)
Parts Margins
Comeback Rate
Repair Turnaround Time
RO Count

Tracking these metrics weekly helps shops identify problems early, improve workflow, and build stronger long-term profitability.

Call 844-304-7688 or visit highwayandheavyparts.com to get the right diesel engine parts for your application.

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

Posted on September 15, 2025June 30, 2026 by Caitlyn Vance

Is It Hard to Be a Diesel Mechanic?

Being a diesel mechanic is not an easy career – but that is also part of what attracts many people to it.

Modern diesel technicians are expected to understand:

Mechanical systems
Electrical diagnostics
Emissions systems
Hydraulics
Computer-controlled engines
Troubleshooting and repair procedures

At the same time, the work can be physically demanding and fast-paced.

However, for many technicians, the challenge is also what makes the career rewarding.

Posted on September 15, 2025June 30, 2026 by Caitlyn Vance

Can a Diesel Mechanic Make $100K a Year?

Yes: diesel mechanics can absolutely make over $100,000 per year.

However, that level of income usually depends on several factors, including:

Experience
Skill level
Certifications
Specialization
Overtime
Geographic location
Industry type

Not every diesel technician earns six figures, especially early in their career. However, highly skilled technicians in the right industries can reach or exceed 100K consistently.