Diesel Shop Profit Margins: What's Realistic in 2026
Diesel repair has some of the highest gross margins in the auto trades — and some of the worst net margins, because shop owners underprice labor and overspend on inventory. Here's what real diesel shops earn, where the money leaks out, and how the top quartile keeps it.
The headline numbers
Healthy diesel shops run a gross profit margin (labor + parts after COGS) of 55–65%, and a net margin (after rent, payroll, insurance, and overhead) of 10–18%. Below 8% net you're probably underpricing labor.
- •Labor gross margin: 65–75%
- •Parts gross margin: 30–45%
- •Shop supplies gross margin: 95%+
- •Net margin (well-run shop): 12–18%
- •Net margin (struggling shop): 2–6%
Labor: where the real money is made
Parts margin is capped by what suppliers charge. Labor margin is capped only by what you're willing to charge.
- •Heavy-duty labor rate range (2026): $125–$200/hr
- •Effective billable hours per tech per day: 6.5–7.5 (not 8)
- •Door rate × effective hours × 22 days = realistic tech revenue
- •Pay tech 28–35% of their billed labor; the rest covers benefits, overhead, and profit
Parts markup that doesn't lose customers
Customers don't price-check labor — they price-check parts. Mark up smart, not greedy.
- •Standard parts: 30–40% markup over jobber cost
- •OEM parts: 25–35% (customers know list price)
- •Maintenance items (oil, filters): 60–80%
- •Specialty/low-frequency parts: 40–55%
- •Use a matrix — don't price every part by hand
Where shops leak profit
These are the line items that quietly turn a 16% net into a 4% net.
- •Comebacks (no-charge re-work) — track these, fire careless techs
- •Inventory shrinkage and dead stock
- •Unbilled shop supplies
- •Discounts and "friend pricing"
- •Underpaid for diagnostic time
- •Cash payments off the books that don't show up in P&L
Frequently asked
What's a good profit margin for a diesel shop?
12–18% net margin is healthy; 18%+ is top-quartile. Anything below 8% means labor is underpriced or overhead is too high.
How much should I charge per hour for diesel labor?
$125–$200/hr depending on metro. Below $125 you're competing on price, not skill.
What's a realistic parts markup?
30–45% on standard parts, 60–80% on consumables. Use a tiered matrix, not one flat number.
Why is my shop busy but not profitable?
Almost always underpriced labor, undercharged diagnostics, or unbilled shop supplies. Pull a 90-day P&L and start there.
Recommended for this repair
Parts pros use for this job
- •OEM replacement parts
- •Maintenance fluids
- •Filters
Tools pros use
- •Mechanic tool set
- •OBD-II scanner
- •Jack stands
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