When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I work as a mechanic and when you use just rtv you should wait about 30minutes if its coolant related or when its oil related you can pretty much start it up by the time you got oil in it. But if you wanted to wait to be sure 30 minutes would be long enough.