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Sorry to be so long getting back. Yes, I change filter every 3,000 miles and add what the filter drops (usually 1/2 qt.). I've been doing this for years with M-1 (Ford ran a test when M-1 first came out, drove a Lincoln 100-K with no filter or oil change, and could find no engine wear of concern...

I recently saw SuperTech synthetic oil at my local WalMart. Is it reputable and truly compatible with other synthetics? I've been using M-1 since it was introduced, and use it in everything including my garden tractor, mower, generator and pickup. Never a problem, except cost. I do complete...

Does anyone have any info on the full synthetic now being sold by Wal-Mart under their own label? It is half the cost M-1. I have been using Mobil 1 in my vehicles since it first came out. In my daily driver with 94K, in my wife's at 44k, I change the filter every 3k, and drain and refill...