Quote:
Originally Posted by CarPoor
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.
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Did not say the clearances changed. Just the opposite. They (obviously) stay the same.
The diff cooler does bring with it a slight risk of failure but for track use with elevated operating temperatures the benefits out weigh the risks.
Also, I note this risk concern hasn't prevented auto makers from fitting coolers for the more expensive (at least automatic) transmission and the much more expensive engine.