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Which oil property determines the rate of ash accumulation?

  • A.The proportion of metallic additive, which is why low ash oils are specified for vehicles fitted with such filters
  • B.The sulphated ash content of the additive package
  • C.The viscosity grade, which determines the oil consumption and therefore the ash reaching the filter over time
  • D.Nothing

Answer: B

Low ash oils exist specifically to extend filter life. The last option explains exactly that link, which makes it a correct and more instructive version. Oil consumption genuinely matters as well. Checking which component actually carries the load settles most questions of this kind at once. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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