How much Sea Foam should I add to a high mileage vehicle’s fuel tank? [SOLVED] Asked by Cody C. In Alabama What do you think the best ratio of administration is for an engine with 215,000 odometer miles?
Hey Cody. Great question!
The higher the concentration of Sea Foam to fuel, the better it cleans. Remember that Sea Foam is only made of petroleum ingredients that can’t harm your engine – you can’t add too much!
What I’d do: Add a full can of Sea Foam High Mileage to a low tank of fuel at least every couple months. I like to add to 1/8 tank or less, then drive 10 to 20 miles before filling the tank with fresh fuel. Adding half a can of High Mileage to your oil crankcase every interval will also go a long way!