Is Synthetic Motor Oil Bad For Old Cars?
A video on YouTube. In Cars, a Krater category.
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An engineer from Engineering Explained answers four common questions about using synthetic motor oil in older cars, exploring whether synthetics cause leaks, whether thicker oil is needed for oil-consuming engines, and when high-mileage oils are useful.
From the video
Answers: Can you use synthetic motor oil in older cars?
- Synthetic motor oil in older cars
- Oil seal compatibility
- High-mileage motor oil benefits
- Engine wear and oil viscosity
What it concludes
- Synthetic oils can be used safely in older cars without causing issues.
- Early synthetic oils caused engine seal swelling due to ester concentration, but modern synthetic oils are engineered to be seal-compatible.
- Switching to a thicker oil may prolong the life of an engine with increased bearing clearances due to wear, but it will not fix engine wear or oil leaks from failed seals.
- High-mileage motor oils include seal-conditioning agents that help recondition hardened or shrunk engine seals and reduce oil consumption in aging engines.
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