The Ford Barn

CatMan1 · 04-05-2022, 09:12 AM

I can't seem to find this anywhere. In my '26 what should I be using for differential oil/grease? Maybe 600WT?

stevests · 04-05-2022, 09:49 AM

Go to a good auto parts store and get a jug of 140 wt. - G4 - should have posted GL4.

J Franklin · 04-05-2022, 10:34 AM

Quote:

Originally Posted by stevests

Go to a good auto parts store and get a jug of 140 wt. - G4.

And if you want add some STP additive to make it more sticky.

40 Deluxe · 04-10-2022, 05:20 PM

Quote:

Originally Posted by J Franklin

And if you want add some STP additive to make it more sticky.

But why do you it "sticky"??

J Franklin · 04-10-2022, 05:24 PM

Since these cars are not everyday drivers, it sticks to the gears and bearings stopping corrosion.

rotorwrench · 04-12-2022, 07:36 AM

Sponsored Links (Register now to hide all advertisements)

SAE 140 gear oil is already pretty sticky. STP oil additive is a viscosity builder. It will add viscosity to what ever it is added to. 600W steam cylinder oild was not an SAE rating. The modern equivalent in viscosity is SAE 140 gear lube.

For a model T with low speed use and relatively light payload, a GL1 type gear lube can be used. GL4 should be OK too since is is low in extra pressure additives. Old original axles may still have babbitt thrust washers in the side bearing assemblies. It is advisable to replace these with bronze or brass washers that are currently available. This soft or yellow metal component is the reason that GL5 type gear oils should be avoided due to the higher concentration of extra pressure additives.

04-05-2022, 09:12 AM	#1
CatMan1 Senior Member Join Date: Jun 2021 Location: Pella, IA Posts: 338	Differential Oil I can't seem to find this anywhere. In my '26 what should I be using for differential oil/grease? Maybe 600WT?

04-05-2022, 09:49 AM	#2
stevests Senior Member Join Date: May 2010 Location: Longbranch, Washington Posts: 526	Re: Differential Oil Go to a good auto parts store and get a jug of 140 wt. - G4 - should have posted GL4. Last edited by stevests; 04-10-2022 at 05:26 PM. Reason: additional info

04-10-2022, 05:24 PM	#5
J Franklin Senior Member Join Date: May 2010 Location: Oregon Posts: 6,021	Re: Differential Oil Since these cars are not everyday drivers, it sticks to the gears and bearings stopping corrosion.

04-12-2022, 07:36 AM	#6
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,534	Re: Differential Oil Sponsored Links (Register now to hide all advertisements) SAE 140 gear oil is already pretty sticky. STP oil additive is a viscosity builder. It will add viscosity to what ever it is added to. 600W steam cylinder oild was not an SAE rating. The modern equivalent in viscosity is SAE 140 gear lube. For a model T with low speed use and relatively light payload, a GL1 type gear lube can be used. GL4 should be OK too since is is low in extra pressure additives. Old original axles may still have babbitt thrust washers in the side bearing assemblies. It is advisable to replace these with bronze or brass washers that are currently available. This soft or yellow metal component is the reason that GL5 type gear oils should be avoided due to the higher concentration of extra pressure additives.