The following chart was posted to wreck.autos.tech a while back. I don't know
how acurate it is, but it does seem to line up with some of the numbers that
have been tossed about recently.
_______________________________________________________________
| |
| SAE Gear Viscosity Number |
| ________________________________________________________ |
| |75W |80W |85W| 90 | 140 | |
| |____|_____|___|______________|________________________| |
| |
| SAE Crank Case Viscosity Number |
| ____________________________ |
| |10| 20 | 30 | 40 | 50 | |
| |__|_____|____|_____|______| |
______________________________________________________________
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42
viscosity cSt @ 100 degrees C
A long time back I remember telling a mechanic the Jensen Healey required
20 W 50 in the gearbox. His response was "Maybe that would be OK in England
but you don't want to run anything that light in California". The chart above
seems to blow a rather large hole in that bit of wisdom.
|