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

Joe K · 05-22-2019, 11:58 AM

When did they start putting brass components into Model A transmissions?

I can't think of a one.

STP now 100% and about 30 years. No adverse effects. Of course I don't drive cross country in the car. And I have noticed STP is a little "slow" at first when its below freezing - but so was the 600W.

I may be corrected, but STP in my estimation is probably the "original" synthetic oil - engineered for consistency of viscosity no matter the temperature. That is their selling point as it "holds up" and augments a thinner lubricant.

I believe I have STP in my John Deere 110 tractor - which has a lot of commonality with the Model A transmission - straight cut gears, no synchros. But John Deere wanted all of outdoors and my first born child for the quart of JD branded gear oil for this application. But JD is like that. What the market (and market ignorance) will bear.

Tranny (both of them) still going strong.

Joe K

05-22-2019, 11:58 AM	#13
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: STP and Transmission: any negative experience ? When did they start putting brass components into Model A transmissions? I can't think of a one. STP now 100% and about 30 years. No adverse effects. Of course I don't drive cross country in the car. And I have noticed STP is a little "slow" at first when its below freezing - but so was the 600W. I may be corrected, but STP in my estimation is probably the "original" synthetic oil - engineered for consistency of viscosity no matter the temperature. That is their selling point as it "holds up" and augments a thinner lubricant. I believe I have STP in my John Deere 110 tractor - which has a lot of commonality with the Model A transmission - straight cut gears, no synchros. But John Deere wanted all of outdoors and my first born child for the quart of JD branded gear oil for this application. But JD is like that. What the market (and market ignorance) will bear. Tranny (both of them) still going strong. Joe K __________________ Shudda kept the horse.