For in-store pickup only, Advance Auto Parts offers the Sea Foam 128-oz. Motor Treatment for Gas and Diesel Engines, model no. SF-128, for $52.99. Coupon code "SAVINGS" cuts that to $37.09. That's tied with our mention from a week ago and the lowest price we could find by $26. It cleans deposits from internal engine parts and removes moisture from oil crankcases and fuel tanks.