>> Manufacturers often have a different agenda to the person who wants to keep their car for years.
I've just thought of a good example. The Toyota Landcruiser went into the £400+ road tax bracket and sales fell. They were only 2 or 3 grammes over.
Toyota changed the oil in the diff to a lighter grade, which reduced the emissions to below the threshold, and the car went down to £200 or so a year road tax.
SO which grade of oil should the owner use?
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