been reading lot of good feedback with synthetic oil as after-run substitute. whats the diff. between mineral/synthetic/petrolleum etc. do synthetic ogger better rust protection, is the other harmful on the rubber seals?

Synthetic oil will not harm silicone seals. Such as the ones in pumped engines.

Dennis

Rislone is green, cheap, and good.

its ok if i use mobil1 synthetic motor oil as after run substitute?