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Using 5W-40 Grade Motor Oil Instead of 0W-40 in a Mercedes-Benz
 
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Question:
Using 5W-40 Grade Motor Oil Instead of 0W-40 in a Mercedes-Benz
I've been using Mobil 1 0W-40 synthetic oil in my 1992 500E Mercedes for 4 years now and have been told to consider 5W-40 grade for my car. I live in southern California, my mechanic only carries 0W-40 weight, and I want to ask if the 5W-40 grade is better then 0W-40 grade all around?
-- Steve Vainshtein, Los Angeles, CA
Answer:
Both a 5W-40 and 0W-40 will provide the same level of protection at high temperatures, especially if you are using a product like Mobil 1. As far as the 0W versus the 5W, this should not make a difference for you other than at start-up. The 0W would provide you a faster start-up at low temperature but you are unlikely to see the differences in your climate. Either grade is fine for you and unless you are having any issues, we recommend you stay with Mobil 1 0W-40 as it is specifically designed for your type of vehicle
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