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Will Switching to a 5W-40 Oil in a Turbo Engine Improve Engine Warm-up Times?
 
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Question:
Will Switching to a 5W-40 Oil in a Turbo Engine Improve Engine Warm-up Times?
I drive a 2003 MAZDASPEED Protegé 2.0L Turbo MT. It's recommended from Mazda 10W-30 or 5W-30 in very cold temps. I'm using Mobil 1 Supersynth 10W-30 all year round but it takes awhile for the engine to warm up on first start, and when it's very hot the engine is very lag'ish and in cold winter time it takes a lot of time to warm up. Would it be wrong to change the weight to 5W-40 in summer and 0W-40 in winter? Or should I just keep 5W-40 all year round since I'm getting a bigger turbo and will be boosting more so the car will run hotter in summer and I definitely need the engine to warm up quicker in the winter but have good protection at the same time. Thank you.
-- Toni S., Garfield, NJ
Answer:
We recommend you use Mobil 1 0W-40. It can be used all year round and will provide outstanding low temperature flow and outstanding high temperature protection for your turbo.
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