I understand all about filtering the oil, and so on and so forth. Now what about the fact that oil viscosity does break down due to heat and shearing pressures? How does leaving oil in for an extended amount of time equate to longer engine life? So it seems we can achieve clean oil that is used past it's prime. Am I missing something?

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D