I took 7 quarts of my own M1 0W40 (thee crankcase holds about 6.4). They returned about 1/2 quart so I figure the overfill must be because they didn't let it drain sufficiently? Should I be concerned? I guess I could use my blackstone pump to take some out, pumping out one little sample bottle's worth of oil at a time. What do y'all think? Is it worth doing?
Last edited: