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Originally Posted by rawze
<SNIP> cutting back the friction made so much difference. they were running purple something.
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Rawze,
They were probably taking worst case (cheap oils past change, additives all depleted) to best case (flush, clean oil, drain and replace all) so that they could have the very absolute maximum difference.
However, it is possible. When the railroads were entrenched with 'sliding' bearings, Timken built a locomotive with all roller bearing technology. One publicity photo showed a number of 'secretaries' (boy would we get in trouble calling them that today) pulling the locomotive. Rolling frictions were reduced by that much.
By reducing the amount of horsepower it takes to overcome rolling (sliding) resistance, it is surprising how much you can gain. My old Dodge truck got a for-sure 1 MPG gain by switching to synthetic, so there is something to it.
Could they have cheated by injecting some 'magic stuff' like molybedinum disulfide? Sure.