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For in-store pickup only, Advance Auto Parts offers the Seafoam Motor Treatment for Gas and Diesel Engines 16 oz. Can for $7.99. Add four to your cart for $31.96 and apply coupon code "ES123" to lower it to $21.96. That's $5.49 per can and the lowest per-unit price we could find by $6. (Last fall we saw a 5-pack for $3 more, which was a better per-unit price by a buck.) Sales tax is added where applicable. This product can be used as a fuel system or oil system additive to clean and control moisture, residue deposits, and more.