Slick 50 is actually a quart of Quakermistake, whoops I meant Quakerstate oil with the Teflon in it. As everyone knows, you should avoid mixing different brands of oil. Well unless you're doing an oil change using Quakerstate oil, you will be mixing oils.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member