Is Synthetic Motor Oil Bad For Old Cars?

Answering many questions surround the mysteries of motor oil!

43w ago

We’re tackling many heavily debated subjects about motor oil in this video and learning how specially formulated motor oil can help new and old engines add more miles to the odometer! Can you use synthetic motor oil in old cars? Can synthetic oils cause leaks in old cars and engines? Where did the idea originate that synthetic oils are not compatible with old engines? If your car is consuming a lot of oil, should you use a thicker oil grade? Finally, when should you use a high mileage oil? I spent time discussing these questions and more with Mobil 1 engineers. Watch for all the details! #Mobil1Partner

Join In

Comments (9)

  • What Jason has failed to mention in an otherwise highly entertaining schoolroom special, is that fully synthetic oils are more slippery than part synthetic and especially mineral oils. They can be particularly useful when you drop the hammer under load in an old classic every 10 seconds. Where as a conventional oil will jell/boil/stop up under extreme heat, the synthetic will fluidly run at a far higher temperatures, keeping your engine cleaner and therefore has greater cooling for that dodgy clogged hot head and bottom.

    Compare with example Castrol GTX Mineral, destroyer of most V8 engines and all motors, that turned oil back into coal in your engine. Especially if you only made short journeys, even though you made regular oil changes.

    I have used fully synthetic 5W/40 in my crappy old MGB high mile blast for 17 years. The old pile loves it and the sticky valve issue was cured instantly. People bang on about treacle pud good old 15W40 but goo it's expensive, throw in some diesel engine oil if you are skint and selfish for beers, it's a fraction of the price, damn near identical spec.

      9 months ago
  • From the info i got from my mechanic ,he said its got more to do with the engine core

      9 months ago
  • Please Jason. Life is all about rumors, myths, and speculation. None of this science, and reputable source hooliganry.

      9 months ago
  • You can probably use those synthetic oils on a lot of cars up to the eighties,

    but I’ll stick to good old 15W40 on the E28.

    The M30 engine was launched in 1968, i bet the tolerances will be a bit wide to use those modern “salad oils” 😬

      9 months ago
    • You didn't watch the video did you?

        9 months ago
    • Just so you know your 15w40 is probably conventional synthetic blend, as most 'conventional oil' is these days.

      Besides, even conventional oil has changed immensely. You hear forum people complaining about the lack of heavy metal...

      Read more
        9 months ago
  • I use Motul V300 in 1986 Carrera without any problem or consumption

      9 months ago