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Wi | I do not know what the older trucks require, but if you have other trucks on the farm as well that are newer it may be nice to upgrade it to the oils they run if possible. I would check with multiple sources first to make sure the newer oils will be compatible. The reason I say multiple sources is due to the number of narrow minded people you will run into. Some will say you can't run that new junk in them, others will say its all the same, then in between you will find some who actually have some knowledge.
Synthetic SAE 50 is what all of the newer truck transmissions use along with synthetic 75W90 in the differentials. | |
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What oil should i use for tranny and rear diff on 1977 GMC 6500?
