Quote:
Originally Posted by redpoint5
How does that even happen?
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I've been looking and seeing a lot on the web that indicates it's the rings that get stuck from buildup and then eventually cause damage to the cylinder walls.
This seems to be very common on Toyota engines. Some say it's the oil relief passages on the pistons being too small. Others that most oils don't have enough of the right detergents to clean out the piston rings (that Toyota brand oil does have a specific detergent package to prevent this).
But there seems to be a consensus that the solution is simply changing the oil as specified in the (USA) manual, that is, every 5,000 miles or 6 months unless you use it strickly for highway cruising (in which case you can go as much as double that).