Decided to sea foam my truck yesterday. Tank was on E (bout 8 gallons left at the time) so i added a can to the gas and then sucked an entire can through the brake booster. The last 1/4 of the can i just dumped in to stall it out.(by this time it was starting to smoke pretty good). Decided to let it sit while i ate so it could work its magic. By this time Mom decided to wash her exploder and i let her know it may smoke a bit, well it did. She went in the house swearing because i filled the entire area up with heavy smoke lol. Truck runs better though! Have another can for the oil when its about due.