Looks like my curiosity will cost me 20 bucks. Sample kit ordered. Thanks for the info. I do not have the funds to test at 5 different places however. But hopefully this one will give me an idea. I will probably keep changing the oil at 10K with the Mobil1 0W40 but it will be interesting to see the results.

Thanks,

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra