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Thanks for your offer, I will think about it.
I already considered less viscous oil but I don't think the tiny gain will pay the higher cost of the oil. I think I can go as low as 5W40 but to see real improvements the second index should be lower as my oil temp is at operating temp 85% of the driving time. So changing from 15 to 5 will affect efficiency only during 15% of the driving time. Well, I guess trying it once will not hurt. Maybe for the next oil change.
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