Hi Linda. That’s one of the best Sea Foam questions you can ask! You can add to fuel whether full or low. However, when adding a full can, adding to less fuel creates a greater cleaning concentration. I like to add a can or two of Sea Foam when there’s less than 1/8th a tank, then drive at least 10 to 20 miles to take advantage of the higher concentration. Can always fill up when fuel is needed. Hope this makes sense!
Hi Linda. That’s one of the best Sea Foam questions you can ask! You can add to fuel whether full or low. However, when adding a full can, adding to less fuel creates a greater cleaning concentration. I like to add a can or two of Sea Foam when there’s less than 1/8th a tank, then drive at least 10 to 20 miles to take advantage of the higher concentration. Can always fill up when fuel is needed. Hope this makes sense!