The Ford Barn - View Single Post - STP and Transmission: any negative experience ?

SAJ · 06-15-2019, 01:23 AM

I agree with Joe K. I use a mix of Mobil 680, STP and Moly disulphide. First thing when it is really thick the gears slow down so fast when you de clutch that I can just whisk it through like a synchro box -Straight through as fast as you can. After a few minutes the lube warms and thins and gears slow down less rapidly and then normal double de-clutching becomes necessary.
This cold oil experience proves that thicker oils change easier than SAE 140 or 190 in my opinion.
I tested and set my brew to an SAE 280 viscosity spec, with higher viscosity index (less reduction in viscosity with increasing temperature) than the raw Mobil 680, due to the added STP
SAJ in NZ

06-15-2019, 01:23 AM	#62
SAJ Senior Member Join Date: Jul 2010 Location: Auckland, New Zealand Posts: 515	Re: STP and Transmission: any negative experience ? I agree with Joe K. I use a mix of Mobil 680, STP and Moly disulphide. First thing when it is really thick the gears slow down so fast when you de clutch that I can just whisk it through like a synchro box -Straight through as fast as you can. After a few minutes the lube warms and thins and gears slow down less rapidly and then normal double de-clutching becomes necessary. This cold oil experience proves that thicker oils change easier than SAE 140 or 190 in my opinion. I tested and set my brew to an SAE 280 viscosity spec, with higher viscosity index (less reduction in viscosity with increasing temperature) than the raw Mobil 680, due to the added STP SAJ in NZ