Those are definitely points I have thought of and are still skeptical about..
I dont belive in those "remedy" type oil additives such as prolong.
This Valvoline stuff I have tried though and it works... I have had anything but great results.
I will definitely take your ideas into serious consideration... But if you use the additive as indicated on the bottle, its safe stuff.
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2001 XE 5SPD 4WD PSU
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I'll stop procastinating tomorrow, okay?