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Re: 5W30 Added to Transmission
Posted to Transmission Forum on 11/5/2018

I have never had engine oil damage a trans. Use ATF+4 when you refill it. There should be no harm. Most trans oils start out with a basic 5W or 10W, then trans specific additives are mixed in along with friction enhancers for the clutches. Hope this helps you. Login to read more.