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In Reply to: RE: Oil change: before road trip, or after?… posted by Wellfed on July 1, 2009 at 06:57:12
Change it before, and if you are using conventional oil do not change per the manufacturer's recommended interval if it is more than 5,000 miles - instead change it somewhere between every 3,500-5,000 miles. Use a top quality oil and a new top quality OEM spec filter
If you have an older car that originally ran on a conventional heavy weight oil, e.g. 20/50, do not switch to synthetic and do not switch to lighter oil, e.g. 5/30.
There is no co-incidence that engine sludging as a problem on low mileage modern cars has co-incided with manufacturer recommended service intervals for oil changes getting longer and longer. So the basic advice is the same for cars that are OEM spec'd to run with synthetic: change it ahead of the manufacturer's recommendation, say somewhere between every 5,000-7,500 miles.
Sludging will kill your motor. An oil change costs virtually nothing, and frequent oil changes (with top quality oil and OEM-spec filter) are the BEST maintenance possible for your engine. (example: Google Toyota engine sludging)
I have an old sportscar that sees extreme (i.e. track) engine use. Despite this, and the fact that the engine is 22 years old has more than 150,000 miles on it and has never been rebuilt, it is well within tolerance and is completely clean internally. There is barely any wear on my cam teeth for example. This is all due to strict discipline with oil and filter changes.
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