2006 Corolla with stock 1ZZ-FE engine, 141k miles, and unknown maintenance history. Oil cap calls for 5W-30 SL. I've had it less than 1,000 miles. Piston crowns are black and only on spark plug #4 is black residue (didn't think to take a photo before cleaning it). No pinging or check engine light. Accelerates okay.
Is it wise to clean those piston tops with a piston soak? What would you recommend soaking it with?
How about using synthetic diesel motor oil, eg Chevron Delo fully synthetic 400 XSP CK-4/SN 5W-40, to clean engine internals?
Thanks
Is it wise to clean those piston tops with a piston soak? What would you recommend soaking it with?
How about using synthetic diesel motor oil, eg Chevron Delo fully synthetic 400 XSP CK-4/SN 5W-40, to clean engine internals?
Thanks