bcw61
Member
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- Sep 14, 2009
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- Northern suburbs of Adelaide
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- VZ 2005 Executive Wagon
thicker oil will make the spider gears harder to turn and could quite possibly make the diff twin more but will suck a fair amount of extra hp out the engine and lower economy
Why? If the vehicle is traveling normally without a lot of hard turns, then the actual 'differential' action will be minimal. I don't see how this would require extra hp or affect fuel economy much, as the 'spider' (side) gears would be carrying out a minimum of differential action.
You could compare it to the pre-load on the side gears - with the cones, in a limited slip differential - and I haven't heard a lot of adverse fuel economy issues with them.