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Thanks all for your inputs. I have been running Mobil 1 synthetic 15-50 in my trannys but now think I will go even lighter to say, 0-40.


I believe that the spec for many Isuzu transmissions is 5W30. Why use anything else?

If spec were straight 30W (like the Pup in question here) I'd use dino SAE30. I could see using a multi-viscosity synthetic but I'd chose the least variable I could get--liekly 10W30. AFAIK, you can't get SAE30 synthetic.

1995 Trooper S
5 Speed
Bone Stock, for now...
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It's better to regret something you did
Than something you didn't do
--Michael Balzary