Quote:
Originally Posted by TheMAN
you want to improve fuel efficiency? run the lightest motor oil possible... there are MX-5 guys running 5W20 or 0W20 synthetic in the BP here in the US, in the hot southern part of the country.... unpredictable oil consumption at times but no appreciable motor wear or damage from analyses reports... to be on the safe side, a 0W30 synthetic will work wonderfully with this engine
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I'm sure you're correct.
I'm running a bit heavier synthetic engine oil at present, but with cooler weather approaching, I'll try the lighter stuff at the next oil change.
What's a good weight of synthetic gearbox oil? I'm still running mineral oil at present.
Should I stick with 75W-90 as the book recommends?