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Message: [QUOTE="jbkingranch, post: 528290, member: 6002"] Switch from 15w-40 Amsoil to 5w-40 a little over a year ago when I moved from Texas to North Dakota. I cranked it up last weekend with my EOT 3 degrees and ECT 2 degrees. Smoked a little at start up but cleared up in about 30 seconds and ran good. Did my first oil change at 15,000 miles this summer. Got a oil report back through Oil Analyzers Inc. saying I had 3.6% fuel dilution. Other then that the viscosity was still good with the fuel dilution, soot was still <.1% with the 2 micron bypass oil filter. I have about 5500 miles on my current oil. Did a sample at 5100 miles through Butler Machinery's lab (the Cat dealer I work for) and it came back with no fuel dilution. Talked to some guy about the fuel dilution problem just going away and they said it caused from all the hard cold starts from last winter. Anyway I still haven't sent in a sample of unused oil to get a base line yet but will be very soon. After I get that info I'll be able to post up some comparison data for you. [/QUOTE]

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