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  1. n1vbn

    GMC Hydra-matic

    The following pertains to the transmision only! The Army originally speced 30 weight motor oil for the M-135 /M-211 for both the engine and the transmision. It will work fine IF you warm up the engine for 30 minutes THEN drive it. The Army changed the oil from 30 weight to (after having many...
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