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Regarding cost, I can buy MCSB for $12.50/jug ($2.50/qt.), while M1 is $24.99/jug ($4.99/qt.) last I checked. Assuming 175K miles in 5 years, that's 35 oil changes at 7 quarts per change, or 245 quarts of oil. That adds up to about $612 over the life of the vehicle - or one payment...