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Why Have Some Car Makers Moved from Recommending 5W-30 to 5W-20 or 0W-20 Motor Oil?
 
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Question:
Why Have Some Car Makers Moved from Recommending 5W-30 to 5W-20 or 0W-20 Motor Oil?
I just bought a new 2.4L Toyota Matrix and saw that the recommended oil was 5W-20 or 0W-20. My older Matrix requires 5W-30 and I have always used Mobil 1. What modifications in an engine change the oil recommendation or is it just for gas mileage improvements?
-- Donald Wright, Anderson, SC
Answer:
The main driver for lower viscosity oil recommendations is improved fuel economy. However, if the OEM (original equipment manufacturer) is recommending a lower viscosity, it is safe to assume that the recommended viscosity has been thoroughly tested in the vehicle and you should follow their recommendation.
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