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All those items have been discussed and dissected here many times so I'm not going to go in depth on them again. The short version is, the Owner's Manual is right and Grandpa, Dad, and all the online recreational oil changers probably aren't, mainly because it isn't 1953 anymore and things have changed, the biggest being EFI (no more flooding and oil dilution), along with much improved engine design, materials, tolerances, and oils. It does bear repeating, though, that idling is an awful (and inefficient) way to warm an engine.
Re: excessive oil changing: I think the more times those little hands are in there taking filters and oil caps on and off, the more chances there are of contaminants getting in the engine vs not doing it at all. The engine normally is sealed up against the environment after all.
Most people get sick of their cars and trade/sell/scrap 'em before they're shot.
Last edited by Frank Lee; 07-23-2012 at 04:48 AM..
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