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

SAJ · 06-15-2019, 10:29 AM

M2M. If you are asking how I got SAE 280 viscosity I used a Brookfield viscometer to return the Mobil 680 to its original viscosity after adding a percentage (I think 10% from memory) of MoS2 oil and then adding STP oil treatment to thicken back up. STP polymers increase the viscosity with temperature index.
I am in Canada at present so don't have access to my laboratory books.
I made 20 litres up years ago and other club members have been using it up too.
I had a full oil lab then since I manufactured oils and greases under the Rocol brand. I still have viscometers but no longer other lubricant testing gear.
If you are asking why I chose SAE280 viscosity spec. it was simple because that is what the original 600W oil viscosity was as far as I recall without access to my notes from many years ago.
I did not spend any time on researching and testing, just made the mix and found it worked better than that from one of the parts suppliers.
Plus I studied tribology when it was a new science in the early 60s and have experience of gear lubes from my manufacturing days.
SAJ in NZ

06-15-2019, 10:29 AM	#67
SAJ Senior Member Join Date: Jul 2010 Location: Auckland, New Zealand Posts: 514	Re: STP and Transmission: any negative experience ? M2M. If you are asking how I got SAE 280 viscosity I used a Brookfield viscometer to return the Mobil 680 to its original viscosity after adding a percentage (I think 10% from memory) of MoS2 oil and then adding STP oil treatment to thicken back up. STP polymers increase the viscosity with temperature index. I am in Canada at present so don't have access to my laboratory books. I made 20 litres up years ago and other club members have been using it up too. I had a full oil lab then since I manufactured oils and greases under the Rocol brand. I still have viscometers but no longer other lubricant testing gear. If you are asking why I chose SAE280 viscosity spec. it was simple because that is what the original 600W oil viscosity was as far as I recall without access to my notes from many years ago. I did not spend any time on researching and testing, just made the mix and found it worked better than that from one of the parts suppliers. Plus I studied tribology when it was a new science in the early 60s and have experience of gear lubes from my manufacturing days. SAJ in NZ