Any toughts ? My lab contact said the oil was shot, low viscosity
Shell Spirax or Mobil PTX (not sure) 75W-90 Porsche 997 43500 miles on the oil
- Thread starter Porscheman
- Start date
75W90NS GL-5 Gear Oil
Designed for transmissions and transaxles - helps to slow synchros for easier shifting across a broad temperature range
Given that it's supposed to have a KV40 viscosity somewhere in the 60-75 range looking up those fluids, I'd say half the viscosity is pretty darn shot.
Lots of wear metals, far too thin for a (assumed) 75W-90. You aren't sure if you put Shell Spirax in or Mobil PTX. Are you actually certain this has ever been 75W-90?
I'd suggest you try something different e.g. Castrol or Ravenol. What does Porsche spec for this gearbox?
I'd suggest you try something different e.g. Castrol or Ravenol. What does Porsche spec for this gearbox?
high Fe, low vis, find out whats supposed to be used and oh I do not know maybe use that.
Porsche recommend Shell Spirax S5 or Mobilube PTX 75W-90, i have now filled up my transmission with Motul Gear 300 75W-90 , smooth as silk, and i will have a maximum OCI at 20000 miles, or maybe once a year since i track the car pretty often
Mobilube PTX 75W-90 has excellent specs, superior to Shell Spirax S5, at least on paper. I'd give it a try if you haven't already.
