Can someone please explain why a simple oil change can give a noticeable increase in power output?

Every time I do an oil change in my daily hack I gain a noticeable amount of power!

Does oil thicken with use, thus reducing the ability of engine components to move freely ?

The oil picks up loose particle's and holds them in suspension, so i guess that would mean thicker?

It probably isn't as sludgy and nice new oil has always gotta be slipperier...

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Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

The effects of heat and movement make the oil thicker with use. Wearing components aren't of much help either.
So, theoreticaly, how much more power would you gain using the thinnest oil you can hold of?

It has to have something to do with the carbon that is picked up though it's use. As more carbon it added to the oil it has more resistance. Oil has a more slippery surface and hence will be effecient but as the oil gets older and carbon build up happens the oil becomes less slippery as carbon is less slippery.
Thats my theory and it sounds good to me. Feel free to tell me i'm wrong

Cheers

Aaron

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Drag racers use a very thin oil, but with subsequently higher wear rates.
Horsepower Heros do the same thing for Dyno shootouts

Redline make some fairly big claims about improvements with their oils, and are well respected in racing circles, but waaaaay to expensive for me.

I am using their products for the gearbox & diff, but I guess you can't do that

I'd be wary about using too thin a oil in an A series - the gearbox may not like it!

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Too many cars, and too little time.

Well the other day I was up at Mark's MRC Dyno tuning.. where we had the dyno shoot out a couple months ago..

He has changed to a much better quality oil.. Elf.. some European brand.. & he has had alot of his customers claiming to getting more power out of their cars..

He will be doing a test of it soon...

Running a car on the dyno with HPR15 Penrite for a few power runs.. then changing the oil & running the ELF oil.. & comparing the difference..

I will let everyone know the results when I talk to him next..

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Baracade
Relationships! The only time you get to sleep with the enemy!
1972 US Export Moke in Bundaberg QLD

that would be a VERY interesting test!

An actual scientific experiment with verified results - BRILLIANT

Look forward to seeing how it works out.

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Too many cars, and too little time.

when i was out at the drags on the weekend the top fuelers were using 50 weight oil. but i guess that is a light oil for a 7000hp motor.

Cheers

Aaron

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go to google (or your other favourite search engine). type "metrology" in and search. you will find the answer somewhere amongst all the stuff that comes up.

Note 'metrology' is the study of thin films of oil under mechanical load (not a study of the weather )

michael

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I thought it was the study of cities

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Too many cars, and too little time.

would most probably also have somethin to do with the fact that when the cyclinder walls have a nice thin layer of oil on them they seal better which gives less leaks which of course means slightly better compression. Better/ higher comperssion equals power.
Also means the parts offer less resistance to movement so there is less internal load on the engine
yes oil gets thicker with time and use, multi grade oils brake down with time and there viscosity doesn't change as redily