Understanding the Basics: Viscosity and Grade The first step in answering "what oil do I need" is understanding viscosity, which is the oil's resistance to flow. Manufacturers specify the exact API service rating (such as SN or SP) and viscosity grade required for your specific engine.
How Temperature Affects Engine Oil Viscosity
One critical additive historically was ZDDP (zinc dialkyldithiophosphate), which reduces wear in older pushrod engines. If you have an older vehicle that burns oil or has high mileage, you might need to consult a mechanic about specialized high-mileage formulas designed to condition seals and reduce leaks.
Synthetic Oil Intervals and Longevity. However, modern catalytic converters can be poisoned by high levels of ZDDP.
How Temperature Affects Engine Oil Viscosity
Similarly, direct-injection engines create more contamination, necessitating oils with superior detergency and longer drain intervals. Conventional Once you know the viscosity, you must decide between conventional, synthetic blend, or full synthetic oil.
More About What oil do i use for my car
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