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<blockquote data-quote="Johnny O" data-source="post: 693662" data-attributes="member: 61743">Couple things.&nbsp; The hp gain from less oil comes from less drag on the reciporicating assembly.&nbsp; This is why hi-perf engines have windage trays.&nbsp; Also, the closer an engine is built to acheive it&#039;s maximum output, the greater a difference little things will make.&nbsp; On a stock street engine you won&#039;t see as much if any difference.I do agree that you can feel a difference in oils.&nbsp; Some people think that&#039;s nuts.&nbsp; That being said, a used oil analysis is the only way to know for sure what&#039;s going on inside your engine.&nbsp; I&#039;ve tried three in the Trac, all 5w-30&#039;s.&nbsp; Motorcraft was okay, viscosity held good, wear metals were a bit high but the 4.0 SOHC throws off a lot of iron anyway.&nbsp; Pennzoil Platinum gave me the best and fairly normal UOA.&nbsp; On Mobil 1 Truck &amp; SUV the iron, aluminum, and chromium were through the roof.&nbsp; I did not try plain Mobil 1 although I got good UOA&#039;s on the Ranger I had before with the same engine.&nbsp; Currently I have Pennz Platinum in the engine again but the next oil change I&#039;m going to use Valvoline Synthetic and get a UOA on that.&nbsp; I have changed out the axles to Mobil 1 lube and the transfer case to Mobil 1 ATF.&nbsp; I&#039;m pretty sure the axles have synthetic lube in them from the factory anyway.Linky-linky-----V</blockquote>

[QUOTE="Johnny O, post: 693662, member: 61743"] Couple things. The hp gain from less oil comes from less drag on the reciporicating assembly. This is why hi-perf engines have windage trays. Also, the closer an engine is built to acheive it's maximum output, the greater a difference little things will make. On a stock street engine you won't see as much if any difference. I do agree that you can feel a difference in oils. Some people think that's nuts. That being said, a used oil analysis is the only way to know for sure what's going on inside your engine. I've tried three in the Trac, all 5w-30's. Motorcraft was okay, viscosity held good, wear metals were a bit high but the 4.0 SOHC throws off a lot of iron anyway. Pennzoil Platinum gave me the best and fairly normal UOA. On Mobil 1 Truck & SUV the iron, aluminum, and chromium were through the roof. I did not try plain Mobil 1 although I got good UOA's on the Ranger I had before with the same engine. Currently I have Pennz Platinum in the engine again but the next oil change I'm going to use Valvoline Synthetic and get a UOA on that. I have changed out the axles to Mobil 1 lube and the transfer case to Mobil 1 ATF. I'm pretty sure the axles have synthetic lube in them from the factory anyway. Linky-linky-----V [/QUOTE]

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