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Last oil change switched to Mobil 1 0w-40. I have found that it doesnt evaporate at high temps like the BMW oil was doing.
I was starting to have to add a quart every few thousand miles with the BMW oil (early build, no oil cooler), but have not had any issues with oil loss with the Mobil 1. Granted it is winter here, so we will see how the Mobile fares this summer.
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