3 ms·

It does because engine oil degrades over time.

• hef19898 3y ago
  Synthetic oil doesn't really so. Edit: long perioda of a car not driven has the effect of not all gearbox and enhine parts being lubricated, that has a negative effect on oil as all that corrusion is ending up in the oil. That so has nothing to do with yearly millage, pulling a car out of storage every 11 months to drive 50,000 miles in one go has the same issues, and a lot more on top.
  • olyjohn 3y ago
    It still does. Especially after heat cycling, and taking on all the garbage that gets past the rings, and all the moisture that collects in the crankcase. Maybe sitting on a shelf is fine, but in the engine it definitely will break down. It lasts longer than conventional but isn't indestructible.
    • hef19898 3y ago
      Sure, but much longer than mineral oils (since when those aren't OEM spec anymore?). Hence the two year / 30k km interballs (whatever happens first.
  • alphabettsy 3y ago
    Water and gasoline still dilute the oil regardless and synthetics are still affected.