OIL

[JMZ421]

First off I have a manual but the viscosity recommendation from way back in 1951 may not match what todays recommendation are. So, I need to to change the oil in my M38 at all levels:

1. What type oil for the engine, transmission/transfer, and differntials? I have I think a Mastercraft 80-90 gear oil I used in my A1, is that Ok for the tranny and differentials? Thank you John

[gearhead]

Engine - 20w-40,15w-40, I use Rotella diesel rated 15w-40, more zddp for our flat tappet lifters, or use a "race" oil with zddp
Trans and transfer - SAE90, SAE 80w-90 GL1 low Sulphur as it can attack yellow metal, like syncro rings
Differentials - SAE90, SAE 80w-90 GL4 hypoid gear oil

Ed S

[JMZ421]

Ed, Thank you very much John

[JMZ421]

Gearhead: Where can you purchase 80W-90 GL1 tranny/transfer oil? All I see is NAPA 90W GL1. The differntial hypoid, I can find. Thanks again John

[gearhead]

you are correct, 90w GL1 from NAPA

Ed S

[JMZ421]

Thank you. John

[Beacher425]

I use this from tractor supply for the Transmission and transfer case:

http://www.tractorsupply.com/tsc/produc ... _vc=-10005