Re: Ford oil spec M2C913-D
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C3 and C4 are HTHS > 3.5, C1 and C2 are > 2.9. So an oil can meet both specs for HTHS if it meets the C3 requirement.
But then it won't have the fuel economy of the C2 oils, so why not just call it a C3 oil in the first place.
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MB Mondeo TDCi wagon, sea grey, on MAK Invidia 16" wheels.
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