Across
1. Engine-block material, often (4,4)
5. Decorative interior and exterior bits
9. Auto-body section
10. Steering-system components (3,4)
11. A personal-watercraft brand (3,3)
12. Shafts on which wheels revolve
14. Flip-down sun shields
16. "American Chopper" family name
19. Tireless assembly-line worker
21. Term for dual-power vehicle
24. Trade term for windshield post (1,6)
25. "One careful ____," used-car-ad words
26. Trips around the track
27. Resurrected a vintage vehicle

Down
1. Tire-valve toppers
2. Much-used body-shop tools
3. Ran the engine slowly
4. Non-standard, factory-installed item
6. Lube again, in a way
7. Urgent used-car-ad words (4,4)
8. A used-car transaction
13. Rebuild an engine or transmission
15. Old-car noise, often
17. Viscosity-reducing lacquer additive
18. Word seen on ammeter
20. Goodyear’s airborne icon
22. Turbo adjunct, ____ gauge
23. Rear-defroster wire pattern