Mixing SM and SN rated PU

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Sep 22, 2007
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I have the 5 qt jug in SN and 1 qt in SM. Total of 7 qts going in. Any reason not to so this with PU. I can't find SN quarts. SM is still on the shelf's at Walmart
 
No problem to mixing them, just don't do a used oil analysis and expect to use the results as formulas will vary.
 
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