Manual Transmission Fluid

[1985xjlaredo]

dam 10-30?? I would at least go with a 20w-50!

 

[89xj]

gl-3 is not thick like a gl-5, although i was concidering using rotella 15w40 syn becuase i buy it in gallon jugs for the engine.

 

[OLAK]

used MTL 70w80, and it works well. label says it is equivalent of 10w30 synthetic motor oil viscosity. Only complaint is noticalbe gear noise. I would go with the thicker MTL 90 next time, or save some money and get synthetic motor oil ( but go for the thicker stuff, 20-50)

 

[89xj]

used MTL 70w80, and it works well. label says it is equivalent of 10w30 synthetic motor oil viscosity.

this is true about the viscosity. as for 20-50, i think it depends on the climate you live in, it may be too thick for sub freezing temps.

 

[lawsoncl]

dam 10-30?? I would at least go with a 20w-50!

The weights for gear oil and motor are not the same. A 75W-80 gear oil has a similar viscosity to a 10W-30 motor oil. Actually the 10W-30 motor oil will be thinner when cold which will improve cold shifting.

 

[winkosmosis]

Wow, I had no idea the numbers for gear oil and motor oil were different.

 

[lawsoncl]

Wow, I had no idea the numbers for gear oil and motor oil were different.

Yup. I'm not entirely sure why SAE maintains a different range of viscosity index numbers for gear oils. It does lead to odd confusions every once in a while. The viscosity between oils of the same grade can vary a fair amount as well.