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  1. D

    Block heater

    The 40 is the warm rating, a 0W40, 5W40, 10W40, 15W40 etc all are in the same viscosity band at 100C and provide the same protection in the hot. There is a further rating called HTHS (High Temperature High Stress) which measures oil viscosity at 150C. But if our engines get oil that hot...
  2. D

    Block heater

    Why are you running 15W40? You'll get better results all year round with a 10W40 or even 5W40. 10W40 is about the same price.
  3. D

    Block heater

    Essentially as you go lower in the W ratings they have to be more synthetic. By the time you get to 5W40 they're pretty much all fully synthetic. At 10W40 there are still some mineral oils. But it's mostly marketing BS.
  4. D

    Block heater

    The W rating on the oil tells you how it flows in the cold. A synthetic 15W40 is no better than a mineral 15W40. The average 15W40 won't even pour at -35C. SAE ratings: 15W oils are good for -15C starting. 10W oils are good for -20C. 5W oils are good for -25C 0W oils are good for -30C...
  5. D

    Block heater

    Swap your oil for 10W40 or even 5W40. 15W40 is risking engine damage in those temps. It can't flow well enough in the cold to get into the oil pump.
  6. D

    Block heater

    I put a similar thing to this on my diesel ute last winter. Has an inbuilt thermostat so only heats to 60C. Fantastic addition. I have it running on a timer for 1.5 hours before it's needed. The windscreen is already thawing, the engine starts without trigging the glow-plugs and the heater...
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