0w-40 is a heavier oil then the 10w-30 you can even see it!
if you push the car to much i would use 5w-50 mobil 1 thats what iam going to use next!

 

From a thread that I read the 10W 30 is heavier than the 0W 40, but the 40 holds its viscosity better at higher temperatures.

This only happens when I push the car hard (like coming back from the track). One of my friends told me to use 50 monograde oil, but I think it is too thick.

I also read that 0W means that the oil has a cold start of - 45F without changing its characteristics.

I wish an oil expert would come tell us this. I just found this:

Use a 5W-30 oil for colder-than-average climates (because lower weight oil is thinner, it helps your car start easier when it's cold outside). A 10W-30 grade of oil is adequate in areas where the climate is warm to moderate.

 

Look what I found:
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Viscosity and Viscosity Index (VI).

The proper viscosity is the single most important criteria of a lubricating oil. The basic performance of machinery is based on the viscosity of the lubricant. Viscosity is, if you like, the resistance to the flowability of the oil. The thicker an oil, the higher its viscosity. The chart on the right shows a rough guide to ambient temperatures vs oil viscosity performance in both multigrade (top half) and single grade (lower half) oils.

Multigrade oils work by having a polymer added to a light base oil which prevents the oil from thinning too much as it warms up. At low temperatures, the polymers are coiled up and allow the oil to flow as it's low number (W number) indicates. As the oil heats up, the polymers unwind into long chains which prevent the oil from thinning as much as it normally would. The result is that at 100°C, the oil has thinned only as much as it's higher rating. Think of it like this: a 10W30 oil is a 10-weight oil that will not thin more than a 30-weight oil when it gets hot.
The viscosity index of a lubricant is an empirical formula that allows the change in viscosity in the presence of heat to be calculated. This tells the user how much the oil will thin when it is subjected to heat. The higher the viscosity index, the less an oil will thin at a specified temperature. Multi-viscosity motor oils will have a viscosity index well over 100, while single viscosity motor oils and most industrial oils will have a VI of about 100 or less.
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From reading this, the oil I have been using, the 0W 40 is a zero weigth oil that will not thin more than a 40-weight oil when it gets hot.

Therefore the 0W 40 is LIGHTER than the 10W 30 - one has a zero weight and the other has a 10 weight.

I got this from www.carbible.com

Will change the oil to 10W 30 monday and see what happens to the oil light flicking.

 

It might be something as stupid as the little copper tab on the OEM oil pressure sending unit snapping off. That's what happened to me.

 

well check this out : http://www.synlube.com/viscosit.htm

it says that 5w-50 its the best oil

 

i also found this:http://www.mobil1.com/USA-English/Mo...AQs.aspx#FAQs3

 

I had the light flicker, dealer fixed it for free. Bad oil sensor. I kept getting the flicker even though my level was fine. It would go away if i revved it.

 

HKS 272/272 Cams
3" Exhaust Piping from the turboback
MBC @ 24psi
AEM short ram intake
Tuned by TurboTrix

 

In the manual it shows you taking out the oil sending unit (IIRC its in the block under the intake mani) and putting the oil presure gauge there.....



Come on guys it NOT the oil 0/40 is thicker than 10/30 after the motor is warmed up....

 

I hope it is something that simple. My car has the oil at the correct level and everything is OK.

 

From what I read, it does not say it gets thicker, it just saying that the 10W 30 weights more than the 0W 40, thats it.

But the 0W 40 holds its viscosity better at higher temperatures than the 10W 30.

Anyway, lets see what happens when I go to the dealer tomorrow.

 

The first reply in your thread is the best. Use an OEM Mitsubishi filter and some 10W30 (the Motul should be fine). I think this will correct the problem.

If it works and you want added assurance on that because of RPM considerations, bump your idle about 100rpm in ECUflash.

 

5psi oil pressure at idle is low as hell... have you checked your water level? When a car is over heating oil pressure will be very low.

 

Yes WATER AND OIL level are normal. I found that there is some oil leaking from the head gasket. I read some threads that say the pressure on the head studs should be 85ft lbs and I tight them at 70ft lbs, so I will tighten that and add Motul 10W 30 to see what happens.

It sucks not to able to drive around on a sunny sunday. I can't wait to fix this.

 

err nm