Quote:
Originally Posted by PIMking
It cleans the gunk that builds up over time.
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That's what I've heard as well. Looks like the one I bought has quite a few cleaning agents in it. I think what most people get concerned about is the seals in your engine wear out overtime and the gunk that has been forced into the seals (somewhat replacing them if you will) can be cleaned out. They all seem to advertise "cleans out engine gunk" so you could be washing away what is effectively keeping your engine seals intact.
Agree, may not be the best idea on older engines but newish ones that have no signs of any leaks should be just fine.
Older engines should just go with high mileage regular oil.