srry for making a new thread on this. i ran seafoam threw my intake hose from vaccum booster and it realy thined out my oil? should it do that coming from the intake? i didnt poor in in the oil.

 

I always change my oil shortly after doing this.

 

ya i didnt think it was gona affect my oil.

 

It never affected the oil in my TJ, YJ, XJ, WJ, Mazda, or Mustang when adding it to the vac hose off the booster.

When I seafoam my engines I add Seafoam to the Vac line for the brake booster, Gas tank, and the oil. an change the oil after driving it a few miles

 

I suppose if you had some blowby it'd let some seafoam into the oil. I've heard that it doesn't take much of it to thin out the oil.