Engine additives, akin to protein supplements for athletes, are touted by some as vital for enhancing vehicle performance, while others regard them as unnecessary. In extreme driving situations, such as heavy towing or extreme temperatures, even advanced synthetic oils might not suffice in protecting engines. For vehicles with high mileage, specific additives can help maintain optimal engine condition.
Among the recommended products is Zinc Dialkyldithiophosphate (ZDDP), a compound recognized since the 1940s for its anti-wear properties. It creates a protective layer, known as a "tribofilm," under high pressure in the valvetrain, preventing metal contact that could lead to damage. Particularly beneficial for vintage engines and those undergoing break-in periods, ZDDP should be added after every oil change, with an optimal dose of 11 to 12 ounces per five quarts of oil.
Another notable additive is Rislone Hy-per Lube, designed to stabilize zinc and phosphorus levels in oil. Priced at $11.99 on Amazon, it offers protection to vital engine components, reducing friction and enhancing resistance to thermal breakdown.