This can lead to metal-to-metal contact and accelerated wear. Furthermore, full synthetics offer better cold-flow properties, ensuring critical engine components are protected during the initial seconds of startup, a period of high wear regardless of the vehicle's age.
Preventing Thermal Breakdown in Full Synthetic High Mileage Oil
High mileage formulations include seal swell additives that condition these elastomers, restoring their flexibility and pliability. In older engines with higher clearances, some mechanics may recommend a slightly heavier viscosity, such as switching to a 10W-40 from a 5W-30, to maintain oil pressure and reduce burn-off.
This uniformity results in exceptional thermal stability, meaning the oil maintains its viscosity and lubricity under extreme heat without breaking down. Drivers should always refer to their vehicle’s owner manual for the manufacturer’s recommended viscosity, such as 5W-30 or 10W-40.
Preventing Thermal Breakdown in Full Synthetic High Mileage Oil
Full synthetic high mileage oils contain higher levels of anti-wear additives like zinc dialkyldithiophosphate (ZDDP) and other friction modifiers. Selecting the Right Viscosity Choosing the correct viscosity grade is paramount, even when using a premium synthetic formula.
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