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Thread: 20 50 mineral oil

  1. #31
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    Quote Originally Posted by eldog View Post

    his reason. Oil is cheap, repair/replacement is costly
    It's a philosophy I've adopted over the years.


    Consider it your engines life blood.

  2. #32
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    Quote Originally Posted by nzspokes View Post
    Hey Steve, what is zero weight oil about then? Ta
    There is no 'zero weight' oil. There is SAE 0W, this is a low temperature description of an oil which enables cranking at -35 degrees C and will allow the oil pump to operate down to -40 degrees C. So what you could describe as a 'zero weight' oil would be a description of a multigrade oil with exceptional low temperature characteristics, eg SAE 0W-20.

    SAE 0W-20 oils are mandated for some American and Japanese manufactured vehicles, this is mainly to contribute to fuel efficiency targets. There is a USA Federal standard called CAFE, Corporate Average Fuel Efficiency. Each manufacturer has to take the average of the fuel efficiency of every vehicle they manufacture, if say Ford sell 5 Litre V8 Mustangs then they have to sell a lot of something the size of a Focus to keep the average fuel consumption of their fleet down. For every 0.1 mpg their CAFE is below the Federal limit, then the manufacturer has to pay a fine of $50 per vehicle produced. So in order to reduce internal engine friction, to reduce fuel consumption, they use low viscosity engine oils and friction modified engine oils. But, if they use a certain oil to pass the CAFE then they must specify that oil be used in service.

    However USA CAFE requirements have no legel standing here in NZ, but the car manufacturers here still religiously recommend the viscosity grade recommended in the USA. With a 'lighter' engine oil viscosity being used, the quantity of oil flow has to increase to maintain full fluid film lubrication between moving engine components. CAFE is currently somewhere around 30 miles/USGal (approx 7.8 L/100 km, 36 miles/Imp Gal) for cars, and about 24 miles/USGal (9.8 L/100 km, 28 miles/Imp Gal) for light trucks. The Trump Administration is reviewing the long term CAFE limits set by Obama out to 2025, pennies to pounds the Obama CAFE targets get the axe.
    There are two songs, "Stairway to Heaven" and "Highway to Hell" which I think give an indication of expected traffic flow

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