I get my oil changed at Mr. Lube, and every time I do, they say "your oil is REALLY black and we recommend an engine flush." (of course it's black, it's supposed to be, dumbass!) LOL... they even told me this today, on my car which only has 20000 km on it. Anyhow, they must sell a lot of these or they wouldn't keep using this sales tactic.
Of course I never get the engine flushes. The whole point of gunk building up inside your engine is that it's not circulating THROUGH your engine... and when you flush it, it loosens from the surfaces and gets put into suspension. I've also read horror stories about engines siezing, etc., after an engine flush.
What do you guys think? Has anyone ever done an engine flush before? Thoughts on how well they work or don't work?