Westway is one of my stores. Hopefully they take care of you. (I am sure they will). I never have any issues from westway service wise, they do a really good job. good managers up there.
ZAKtech products just make a bunch of additives and such. It's a vantile thing (guy who owns the store also owns the ZAKtech stuff).
It most likely won't hurt your motor. Not sure what it does to the viscosity or durability with heat though. I'd hope it'd improve it and not make is worse. If you have questions, just ask them about it.....they should have the answers, afterall they're the ones selling it.
Personally I would stick to the basics in all my cars....synthetic and synthetic blend.
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2013 Performance White Boss 302
-Stock
2002 Mineral Gray GT
-VT engines Stage 2 N/A cams, full SLP exhaust, 4.10 gear...etc.
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