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Why Have Multiple 30 Grade Motor Oils if the Protection Level is the Same
 
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Question:
Why Have Multiple 30 Grade Motor Oils if the Protection Level is the Same
I see you stated your Mobil 1 0W-30 wt oil offers the same protection as your 5W-30 and 10W-30 oils. If so, why in the world would you continue to make the 5W-30 and 10W-30 oils when one could have much better oil flow at start up with an additional bit of fuel economy?
-- Nathan Ziegenfuss, Lehighton, PA
Answer:
You are on the right track which is why oil recommendations are getting lighter and lighter. But first give credit to the OEM’s (original equipment manufacturers) who over the years have produced better and better metallurgy with tighter and tighter tolerances. The better finishing of parts has allowed for better lubrication even at lower viscosity such as SAE 5W-20 or 0W-20.
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