According to SOPUS, GTL base stocks are not used in QS products or what was PYB (conventional Pennzoil) formulations.
I still have a bunch of QSUD I got for $0.99 / qt. after rebate from Menard's a few years ago. It ran fine in my wife's 2011 V6 Mustang and it will run fine in her 2017 V8 Mustang and my 2012 Hemi Ram.
I still have a bunch of QSUD I got for $0.99 / qt. after rebate from Menard's a few years ago. It ran fine in my wife's 2011 V6 Mustang and it will run fine in her 2017 V8 Mustang and my 2012 Hemi Ram.
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