Is STP a good thing for oil?

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Does VSOT actually thicken up oil too? I bought like 12 bottles from NAPA last year, the small silver bottles..i belive they were dated 1999. Directions say to add entire bottle to 4-6 quart sumps. WIll this VSOT thicken up a 5w30? and if so to what grade? Maybe its best to ration out the bottles. like 1 1/2 oz per quart?
 
Originally Posted By: demarpaint
In a beaten oil burner it has its place, new or old engine. I wouldn't put it in anything I own that is running well.


+1

To the thread starter, if you're worried about zinc and add packs, I'd run a high mileage 5w30 like MaxLife...
 
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