oil question?

[Neutrino]

Ok saturday i'm changing my oil and normally for my car is recomended 5W30. well i was talking to this guy on what brand should i use and he recomended redline which i understand is used in racing. he also recomend to use 10W30 which is slighty thicker and should better if i push harder my engine especially in the summer when the engine would heat better.

also i undesrtand that if i would get Mobil 1 which is good oil but even the fully syntetic version is not 100% pure syntetic while the redline is.


So what do you guys recomend? use the redline(which cost 9$ a quart) or mobil 1 which i still have to find out how much will cost (obviouslly cheaper though)
also should i go with 5W30 as in the manual or use 10W30?

[ivymike1031]

At high temperatures, there is very little difference between the 5w-30 and 10w-30 oils, at least in regard to Newtonian viscosity. It's in the extreme pressure scenarios that multigrade oils may have trouble, as far as I know.

Under extreme load conditions, at higher engine speeds (high pressure, high shear), natural 5w-30 may break down slightly faster than the 10w-30 does, and the 10w30 would probably provide better protection. A straight SAE30 would be even less prone to this breakdown.

If you believe the "company line" of synthetic oil manufacturers, the above concerns do not necessarily apply to synthetic oils, which supposedly can resist shear breakdown much better than the dead-dino variety can.

I would personally trust Mobil-1 more than a "specialty" oil company (since the specialty company probably gets their oil from a big-name company anyway). I don't have any specific information to support this prejudice, so your own opinion is at least as good as mine.

[GTStang]

I use Redline tranny fluid and the oil for my rear end. But those don't get change often most people never do until something goes wrong. I like Redline products but at the prices per quart compared to the gain they suggest 5-10hp is it really worth it? I don't choose to think so. Also you need to change your oil frequently... expensive proposition

Also I think the person suggesting the thicker oil, used this theory. The thinner oil you can use before gettin blow by the more power you free up. So if Redline gains power it's probably thinner. So bump up a wieght to be on the safe side.

[Neutrino]

thanks both of you for your advice.
In the end i decided to go with mobil 1 fully syntetic. I mean everyone says that is awesome and i found 6 quarts for only 23.39$ in Costco(love that place) i woul've payd 45 $ for 5 quarts. So i guess is just not worth it.

[911GT2]

You'd be amazed at how little difference there is between cheap and expensive oils.