| since what really matters is what was used longer term and how often (or not) it was changed. This assumes what's in the engine right now isn't WD-40 or something stupid like that... There are oil analysis companies around that will take your sample and then supply a printout... I've used these guys -- takes a few days after sending in the sample to get the results: [ http://www.blackstone-labs.com ] Visit the web site and look at what service they provide. If you go with Blackstone -- send your package via UPS, we've not had the best of luck with USPS....
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