QSFS vs Magnatec.

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That explains why you have ancient M1 15w50 ā€œred capā€
Haha I remember when I bought it. It was at the very back of a shelf full of M1 (SN rated) quarts at this tiny convenience store. I knew it was a classic BITOG antique, so I bought it as a souvenir:D
 
I remember M1 15W-50 EP (that was the first M1 15W-50 I knew about). They then discontinued it and I think I bought up all the quarts Target had for like $1 a quart. Sometime later Mobil brought back their 15W-50 in the "Silver Cap" form.
 
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