Across 1. Oil-level indicator 5. Electrical system safety valve 9. UFO driver 10. Sudden tire failure 11. Range of piston travel 12. Invitation to hitchhiker, perhaps (3,2) 14. Modern steering-wheel-hub component 16. Diesel counterpart of gasoline octane 19. Take the wheel 21. Trips down the track, in drag-racing lingo 24. Service-station fixture, frequently (3,4) 25. Often-ignored car sound 26. Fastener type, e.g. T-15, T-40 27. Non-powered technician’s vehicles

Down
1. Dash-gauge face
2. Body-shop professional
3. CB-radio code for T
4. Battery wires
6. Leaf spring to axle housing connector (1,4)
7. Car-warranty adjective, sometimes
8. Dashboard-switch type
13. Item nicknamed bump stick
15. Intake-system item
17. CAFE is Corporate ____ Fuel Economy
18. Final word in right-side-mirror message
20. Driver ____, common accident cause
22. Accumulated cooling-system deposits
23. Alternator output, briefly