Quote:
Originally Posted by 04_Sentra
I suspect the FE improvement from running thin oil is so small that you need a really high mpg car to even notice.
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Of course the individual gains of such a mod are small, but it'd be rather foolish not to take advantage of them.
Combine a lot of these small gains, and the total gain becomes considerable.
On the model of car I drive, Volvo went from 5 L/100km in 2005 down to 3.9 L/100km in 2009 (-22%) by using lots of small improvements - thinner engine and transmission oil being one of them.
The cars still look very much the same.
I'm taking advantage of that, and apply the changes to my own car.
Transmission oil is scheduled to be replaced during the next service, so I'll be asking the dealer to put in the newer model's thinner transmission oil and to revert to 0W30 engine oil.