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Oil Change Question

Created July 20, 2007, at 5:55 pm by dnamrnatrna

I just had my oil changed in my HCH at the dealer. I used Redline synthetic 5W – 20, which according to the manual is OK. I thought I would increase my mileage, but I lost nearly 10 miles per gallon by doing this. I am wondering if the small viscosity difference caused the problem. Or, could the mechanic have poured in all 4 quarts and overfilled the crank case where the crank shaft bumps the top layer of oil??? Is this possible? Any thoughts?

dnamrnatrna

Junior Member

4 years ago

I forgot to mention that my Civic hybrid is an 07

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MSantos

Senior Member

4 years ago

Indeed. The recommended oil is 0W20. The 5W20 is only to be used as a substitute on exceptional cases where 0W20 is not available.
Almost every HCH-II owner I know of that has tried 5W20 reported a measurable loss in fuel economy.

Also, overfilling can also cause a loss in fuel economy.

MSantos

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