Career comparison
Diesel Mechanic vs. Parts Salesperson
Side-by-side pay, training, growth and day-to-day duties to help you choose between two related careers.
Diesel mechanics earn more at the median ($61,770 vs. $38,630), while parts salespeople usually get to work faster (1–3 months on the job of training). Diesel mechanics diagnose and repair trucks, buses and diesel-powered equipment. Parts salespeople help mechanics and customers find the right parts for vehicles and equipment.
Pay data: BLS OEWS, May 2025 · Outlook: BLS 2025–35 · Checked October 15, 2026
| Diesel Mechanic | Parts Salesperson | |
|---|---|---|
| Median pay | $61,770 ($29.70/hr) | $38,630 ($18.57/hr) |
| Pay range (10th–90th) | $44,530 – $88,740 | $28,240 – $62,890 |
| Job growth, 2025–35 | +3.6% (about as fast as average) | +3.0% (about as fast as average) |
| Openings per year | 24,400 | 30,000 |
| Typical entry education | High school diploma or equivalent | No formal educational credential |
| Training time | 6–24 months | 1–3 months on the job |
| Key credential | ASE Medium-Heavy Truck (T-series) | ASE P2 Automobile Parts Specialist |
| Work setting | Diesel mechanics work in fleet shops, dealerships, independent repair shops and on the road as field service techs. | Parts salespeople work behind counters, in warehouses and sometimes in delivery vehicles.. |
What each job does
Diesel Mechanic
- Perform preventive maintenance inspections and services
- Diagnose problems using diagnostic software and test equipment
- Repair or rebuild engines, transmissions and drivetrains
- Inspect and repair air brakes, steering and suspension
- Service aftertreatment systems such as DPF, DEF and SCR
Parts Salesperson
- Help customers identify the correct parts
- Look up parts by VIN and catalog
- Check inventory and place special orders
- Process sales, returns and warranty claims
- Advise customers on installation basics
How they’re similar
Both careers involve problem-solving and indoor work. They sit in different fields, mechanics, maintenance & manufacturing and sales & retail, but share transferable skills such as problem-solving and customer service.
Which should you choose?
Choose diesel mechanic if…
- I love figuring out why engines and machines fail
- I don’t mind grease and heavy parts
- I’m comfortable using computers for diagnostics
Choose parts salesperson if…
- I like cars and machines
- I enjoy solving problems
- I like helping customers
Still torn? Take the Diesel Mechanic fit quiz and the Parts Salesperson fit quiz, or the full Career Match Quiz.
Quick comparisons
Which pays more, diesel mechanic or parts salesperson?
Diesel Mechanics earn more at the median: $61,770 versus $38,630 for parts salespeople, based on BLS May 2025 data.
Which takes less time to train for?
Parts Salespeople typically train faster (1–3 months on the job) than diesel mechanics (6–24 months).
Which career has better job growth?
BLS projects diesel mechanics to grow +3.6% from 2025–35, compared with +3.0% for parts salespeople.