Older engines that use flat-bottom lifters should use oil (or an additive) that has enough ________.

Question

Quizplus · Accepted Answer

Older engines, especially those with flat-bottom lifters, require oil with sufficient ZDDP (zinc dialkyldithiophosphate) for its anti-wear properties. ZDDP acts as a buffer to prevent metal-to-metal contact within the engine, which is crucial for engines designed before the widespread use of roller lifters.

Older Engines That Use Flat-Bottom Lifters Should Use Oil (Or