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Ask Mobil Archive -
Fuel Economy
DateQuestionAnswer
07/19/2010
Is Decline in Fuel Economy Common When Switching to Synthetic Motor Oil?
I changed to synthetic oil and since then, my mileage is continually getting worse. Is this normal with the first change?
When you change oil types it is not unusual to see changes in fuel economy or even oil consumption for the first couple of oil changes. We assume you are comparing the same viscosity. If you are, then...
07/10/2010
Can Mobil 1 Advanced Fuel Economy be Used When Towing?
Should I use Mobil 1 Advanced Fuel Economy oil if I am pulling a trailer?
It depends on the viscosity grade recommended for the vehicle towing the trailer. Assuming your vehicle recommends using a xW-30 or a xW-20 engine oil, there is no reason you could not use Mobil 1 0W-...
08/04/2009
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 oi...
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...
05/29/2009
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 mu...
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 bett...
05/06/2009
How Long to Wait Before Switching New Car to Mobil 1?
Why are there so many opinions when to put Mobil 1 in a new vehicle? It seems like everyone that I ask, and I'm talking about mechanics, have a different opinion on when I can switch from the original...
You can use Mobil 1 as soon as possible.  We recommend you use Mobil 1 0W-20 Advanced Fuel Economy for maximum cold weather protection and a chance to also maximize fuel economy while providing the pr...
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