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Originally Posted by uberhahn
Sadly, nobody is right all of the time. I'm afraid it's your turn, spindleshanks.
Dino oil will expand oil seals and gaskets, while synthetic oil will not. I has nothing to do with viscosity. I speak from personal experience with my own leaky vehicles, in addition to my profession in the automotive industry.
If your oil is "clean" - low particulate count, while maintaining it's viscosity, changing the filter only is a perfectly viable maintenance method. There are bypass filters on big-rig semi trucks that use bypass filters with entire paper-towel rolls as the filtering element, extending the oil change interval significantly.
A little research goes a long way...  |
Full flow filter, like the long life ones from Amsoil are 15 microns. By-pass are 1 or 2 microns usually. Wear normally starts at 5 microns, so you can see whey by-pass is so great. The By-pass on my dads boat, 3406 Cat (about 900 cu in, and 600hp) is about 9" around and 16" tall, and filters at 1 micron. Even in a diesel which turn oil black from carbon, the oil looks clean after 500 hours.
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-John
'05 Dodge 3500 SRW 4x4 SLT 5.9 Cummins QC LB NV5600
2003 SR5 4Runner, V6 4WD. 1" cornfed lift
Previous Toyota's
'92 Red Truck NALA
Speed doesn't kill, its the sudden stop that hurts.