Well the only information available to make some distinction between the two is based on the Seq. IIIH test where M1 EP scored 20x better than the industry limit for viscosity increase, whereas regular Mobil 1 was 10x. The price difference is so small I always opt for the EP. It has greater oxidation resistance.The question I have is...when I buy Mobil1 EP, over regular Mobil1...one says good for 20,000 miles and the other days good for 10,000 miles. But how much better is one over the other? What separates the two?
You'll notice all the other off-shelf oils only claim 10x better on the IIIH, so Mobil 1 EP is double that.
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