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Is a 15W-50 Oil Too Thick for Cold Temperatures, and Would Mixing with 0W-40 be Better?
 
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Question:
Is a 15W-50 Oil Too Thick for Cold Temperatures, and Would Mixing with 0W-40 be Better?
I have a supercharged 2001 BMW 330ci with 107,000 miles on it. It has always burned oil, even when new. Now, however, it burns a quart in only 650 miles. I was told I should have been using 15W-50 synthetic oil, but being in NJ, I was concerned that switching to a 15W-50 would be too thick for wintertime. Can I mix 0W-40 and 15W-50 in the winter for better protection, and use straight 15W-50 in the warmer months? The car is garaged year round, but sits outside at work during the day.
-- Alex Adams, Union, NJ
Answer:
New Jersey has cold enough winters that we recommend you continue to use 0W-40 at least in the winter. In the spring, summer and fall you can use Mobil 1 15W-50 and see if this improves your oil consumption. If switching to the 15W-50 does not improve your oil consumption you may want to have your vehicle checked. You can also try Mobil 1 High Mileage 10W-40 all year round.
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