I found today in the NSXPrime forum..., some very interesting information about engine oils based on a real life testing...,
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CAN YOU PICK UP PONIES JUST BY CHANGING YOUR OIL?

Virtually every synthetic oil manufacturer boasts that its product is the best, that it will give you extra power, increase mileage, last almost forever, etc. Royal Purple synthetic oil claims to be the “performance oil that outperforms.” The company also boasts that their synthetic oil will measurably increase horsepower and torque. In a world filled with exaggerated claims and advertising hype, we decided to put Royal Purple’s claims to the test.

I gave SLP Performance Parts in Toms River, New Jersey, a call, explained what I wanted to do and arranged to get some time reserved on their chassis dynamometer. The plan was simple and straightforward: We’d run a couple of dyno passes on a 1998 Corvette with a fresh fill of Mobil 1®, drain it and fill it with Royal Purple using a new filter and run a couple of dyno passes to see if there was any difference in the hp or torque output. Brian Reese, SLP’s director of engineering, suggested that we do the oil change with the C5 still harnessed on the dyno to virtually eliminate the chance for any variation due to harness tension between tests. With that, the C5 was tethered and the first dyno tests began. A second dyno pass was run to check for consistency of results and the second test result overlaid the first one exactly. The oil temperature was 200° when the tests were run.

The Mobil 1® was drained and the C5 filled with Royal Purple 5W30 with a new K & N filter. Two dyno passes were run after letting the Royal Purple warm up to 200°. Lo and behold, Royal Purple lived up to its claim as you can see from the actual dynamometer printout here. The actual dyno test numbers were as follows:



Oil...............SAE Power (HP)......... SAE Torque (Lb-Ft)
Mobil 1®............344.5........................ 358.0
Royal Purple........348.3........................362.8
Total Gains.............3.8..........................4.8
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I can confirm this with my foot dyno. I don't use it my car now but in my ap1 when I bought it off the guy it had mobile 1 in it, switched it out right away for some royal purple and could feel the the difference right away. The entire power band felt smoother also.

 

^ RP has been used in my car since it's first oil change.

 

I always feel a bid difference when I change my oil with motul 8100 especially with the bawler v300.

 

hey Dave, how much is RP?

 

Nice find... Looks like I'll switching over to Royal Purple on the next oil change.

 

motul or purple stuff?

 

Not sure offhand but it is expensive. It think I paid about $18.00 ltr from Lordco.

 

I would take this with a grain of salt.

They never stated what grade the Mobil 1 was. Say they used a 10w40 oil, then it makes perfect sense that the dyno numbers show higher on the RP since it is a 10w30.

Now, have them try it again with a 0w20 oil and see what type of gains can be had.

Also, how much mileage did the motor have? It the motor had worn rings, a thicker oil will help the rings seal better and show more hp on the dyno.

Another thing to add is that 4 hp gain on a dyno isn't that uncommon. I believe it is within their % of error.

 

^^^^^ solid points, especially about the dyno. Heat can make you loose 10 hp in 1 hour but the next hour after you will gain 15. Seen this first hand.