Quote:
Originally Posted by Mikem53
When the car is engineered for 0-20w oil.. It's more to it than just vi.
Adding zddp adds phosphorus above the 800 ppm that adversely affects the cats and emissions. More to it than someone's special oil mix. Maybe the engineers know a few things we should listen to.. Especially long term and warranty wise.
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And unfortunately, we don't get to see the engineers' direct recommendations since our owner's manuals are written by Subaru of America and Toyota USA (with Corporate Average Fuel Economy in mind) and not by Fuji Heavy Industries.
Quote:
Originally Posted by Pablitomarrero
I agree, and 0w20 oils tend to be high quality. Keep in mind that this oil was chosen for daily use, NOT for track and constant heavy engine demand! For this a heavier oil is recommended.
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It depends on the oil really. There are good uoa's here on Red Line 0W-20 from a supercharged, tracked car. No need to go to a thicker viscosity if the oil is up to the task!
-Dennis