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I work for a CAT dealer and we do oil analysis religiously, and it has saved several power train components. If there is a CAT dealer near you they would have sample bottles, or a Cenex also does them. Hope this helps a little.
I use Blackstone Labs for my samples. Go to http://www.blackstone-labs.com, and click on 'Free Test Kit'. They'll send you a sample bottle. You send it back full of oil (USPS-friendly container is supplied - $1. 52 in postage), and $20. They e-mail/snail-mail back your analysis in a couple of days.