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Well, I've found the high revs thing to be pretty much true. When my idle stumbles around a little bit, a good run up to higher RPMs usually helps (Of course, done when the engine is up to operating temperature).
So I'd agree that running the engine up to higher RPMs is good... I would not say:
"Keep it above 4000rpm"
I doubt it's a good idea to keep your engine running over 4000RPM AT ALL TIMES. Even when properly warmed up. Not that I think the engine will grenade, I just think it's not necessary.
So, I'd say "it's a good idea to push the engine above 4000rpm relatively frequently in order to burn off carbon deposits"
BTW, the process of running the piss out of the engine in order to burn off carbon deposits is sometimes called "an Italian Tune-up". Or so I've heard it called.
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2001 Boxster - Grey on Grey
1969 911T Targa - 'Stinky'
http://www.zoto.com/frayadjacent/img...f27a-4a399.jpg <---- my car. ^ crap I post.
"The existence of the flamethrower is evidence that someone, somewhere once said 'I want to set those people over there on fire, but I don't want to have to walk over there to do it.'"
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