Quote:
Originally Posted by RockCrusher
Farcical yet true?... Ok.
The viscosity is selected for the clearances and load. No reason to up the viscosity or lower it without a corresponding change in clearance. The load won't change at least its maximum won't change as long as the engine remains stock.
If you are truly concerned about the effects of track use on the diff consider a diff fluid cooler. Keeping the fluid hot but not letting it get too hot will do more to ensure long and trouble free service life from the diff than playing with diff fluid viscosity.
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No, not true from a materiality standpoint.
Got any evidence to reduced clearances? And before you stick your neck out there just know that a 75w90/110/140 will get through said clearances just as quickly as the OEM 75w80. If not we’d all have issues in winter.
Why risk an aftermarket cooler that could fail when upping the viscosity will more than suffice and without appreciably elevating temperatures? My track car RX8 actually saw the manual transmission temperatures drop from 250F to 220F average when I went from 75w90 to 75w110. My rear differential did similar dropping from 280F to 255F average going from 75w90 to 75w140. Been it like this for 11 years now.