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Is this a normal amount of carbon build up for a 14 yr old almost 200k mile turbo engine?
2006 Saab 9-3 2.0T. Wondering if my engine was replaced or maybe alot of highway miles?
pictured is top of piston through spark plug hole. Crosshatching is still visible on cylinder walls.
2 Answers
- boy boyLv 74 months ago
todays fuels are so clean that its extremely rare to have a build up ..go back to my time ..i started driving in early sixties ..you had to decoke an engine circa every 15.000 miles ...nothing wrong with top of your pistons
- Anonymous4 months ago
Carbon on a piston has no bad effect at all. In fact it helps to provide good compression by sealing at the circumference. 'If it ain't broke, don't fix it'.