evoinit

what is the best oil weight for evo please help

jedinite

I run Mobil-1 5w30 (their blue cap, "new car formula").

No way I'm giving up a few horspower with a heavier weight oil, with my configuration. With a turboswap, very high horsepower configuration, maybe. But on stock turbo under 350HP i'll be sticking with Mobil-1 5w30...

superz

iTrader: (7)

no hp loss will be had with 10-30w or 15-50w (which is what I run). If you consider that the ONLY time that 5w weight is being used is when you first start it up and run for about 3-5 minutes. After that , all the weights flow like water. My oil (mobil 15-50w) becomes as fluid as anything when it reaches normal temp, which in our cars is extremely high. I would definetely recommend 15-50w MObil 1. As far as start up flow, when you compare standard 5-30w, they both have the same viscosity when cold. Thats the benefit of synthetics. So hp loss is just a theory at best.

DA-Evo

redline 15w-50

3171

i use 15w-50 hks

SOF

The only time you should use 5W-xx is when the ambient temperature is constantly below freezing, otherwise you're just wearing out your engine with such a thin oil.

2Cool

There is a pretty big difference between a W-30 and a W-50 oil's viscosity at high temperatures. Thats what that part of the oil designation stands for, viscosity at high temperature. So making a statement like "becomes as fluid as anything when it reaches normal temp" is misleading and uninformed. It is thicker at high temperature. It will not flow into very tight machined tolerances as well as a lighter weight oil. If drag induced horsepower loss is actually a factor, it will be worse with the thicker oil as the crank splashes into it.

I am sticking with 10W-30 oil myself, in accordance with the warranty guide. Brand is not as important, so long as its high quality and meets the requirements stated by Mitsu.

skibum

Does the evo use the same oil filter as the lancer?
Thanks.

superz

iTrader: (7)

actually, after noticing that you have also moded your Evo, I find it funny that you think 30w oil is up to high-reving, higher boost, more heat situation. You are the "informed", so why not consider that even 50w oil becomes very thin at high temps. You ever heard of viscosity breakdown? Just because its mobil 1 doesnt mean that its viscosity stays at 50 when dealing with extremely high heat, it probably drops down to a 30-40w oil. The 50w implies that at a given temperature the oil will be that weight, any temps higher may thin the weight and cause viscosity breakdown. But hey, to everyone has their own opinions.

mayhem

iTrader: (9)

If a xW-40 could be found it would be perfect. The motor in the INfiniti Q45 has some of the tightest bearing clearances of any motor and the manufacturer recommends xW-30 although xW-40 and xW-50 is perferred by performance enthusiasts. The only thing that might suffer is a fraction of a MPG. Other than that you're only perserving your engine.

EVO3675

Lets say If you have 10W30 oil the 10W stands for 10 weight winter meaning the oil will remain at a 10<> weight during cold climate for increased flow ,if the oil doesn't reach a high temp it stays light until normal operation temp.after the temp is reached its behavior is of 30 weight. In states like Arizona where temps can be 110°+ all summer 10w30 will probably be just 30 weight. The multi viscosity oils were made to prolong starter and closes tolerance engine life during cold start because the oil from the 50' to 80's was mostly single weight and used in cars that tolerances were measured in much looser clearance. It is recommended if you autoX your car you go to 10w40 to 15w50 but mpg will suffer on daily drivers.higher oil weight =higher oil press lower flow, light oil =lower oil pressure higher flow

LetsGetThisDone

iTrader: (1)

1. GREAT 17yr old thread bump.
2. That is not how oil viscosity works.