[E91 M Sport]

Originally Posted by Terraphantm

It just means it's thicker than expected if you had a straight 10w oil at operating temperature.

halle-fucking-lujah thanks for defiantly providing my point. If our 0-40 weight oil thinned out and as you and hassmaschine think, we'd be spinning bearings and destroying out engines on a daily basis. Funny how that isn't happening.

[Terraphantm]

Originally Posted by E91 M Sport

halle-fucking-lujah thanks for defiantly providing my point. If our 0-40 weight oil thinned out and as you and hassmaschine think, we'd be spinning bearings and destroying out engines on a daily basis. Funny how that isn't happening.

Are you trolling or do you just not know English? Being thicker than expected doesn't mean it thickens as it warms up. Let's say you meat a fat guy, you expect he's 400 lbs. Turns out he's lighter than expected and he's actually 350 lbs. Does that mean he's light? No; he's still huge. Likewise, an oil that's thicker than expected at a given temperature does not mean it's thicker than it would be at a lower temperature. I don't know how to explain it in simpler terms.

If the oil gets hot enough, you *will* spin bearings and destroy engines. Especially at higher revs where the film strength becomes important.

[hassmaschine]

Originally Posted by E91 M Sport

halle-fucking-lujah thanks for defiantly providing my point. If our 0-40 weight oil thinned out and as you and hassmaschine think, we'd be spinning bearings and destroying out engines on a daily basis. Funny how that isn't happening.

dude just stop. please. you are absolutely wrong.

please start a thread on this on BITOG and see how it goes.. you'll be laughed off the internet.

[Jeff@TopGearSolutions]

Regularly hitting 260? That's pretty high.

250 would be a reasonable and I know it's only 10 degrees away but just 10 more degrees at 270 and your at limp mode.

At 260, you'll need to drive pretty conservatively to keep the temp from rising.

If you want peace of mind, get an oil cooler. Hot oil, although not dangerous at 260 has the ability to shear to lower viscosity and will negatively affect seals over time.

[bmw201113]

Originally Posted by Jeff@TopGearSolutions

Regularly hitting 260? That's pretty high.

250 would be a reasonable and I know it's only 10 degrees away but just 10 more degrees at 270 and your at limp mode.

At 260, you'll need to drive pretty conservatively to keep the temp from rising.

If you want peace of mind, get an oil cooler. Hot oil, although not dangerous at 260 has the ability to shear to lower viscosity and will negatively affect seals over time.

It hit 260 only when I am operating the vehicle for about a hour and a half. Usually it stays around like 245 250. How would I do a oil cooler. I'm definitely interested in this. I plan on keeping the vehicle long term and would like to get the most life. Also plan on modding it with a supercharger or the bpc turbo when it's released.

[jc5988]

Originally Posted by bmw201113

Hey all I have a e92 lci and my oil temperature just hit 260 it didn't go over or anything but I was wondering if that's a sign or a symptom of a issue occurring? I've heard from a couple people that bmw tend to run hot but I guess that seems to hot for mental comfort to me. I did search the forum but couldn't reach any definitive answer

do you have automatic or manual tranny?

[bmw201113]

Originally Posted by jc5988

do you have automatic or manual tranny?

I have automatic

[PhaseP]

Originally Posted by E91 M Sport

halle-fucking-lujah thanks for defiantly providing my point. If our 0-40 weight oil thinned out and as you and hassmaschine think, we'd be spinning bearings and destroying out engines on a daily basis. Funny how that isn't happening.

This may help you:

http://www.viscopedia.com/viscosity-...es/engine-oil/

SAE 30 numbers:

0 Celcius 1124 viscosity
100 Celcius 8.8 viscosity


SAE 0W30 numbers:
0 Celcius 474 viscosity
100 Celcius 9.3 viscosity

They both thin as temperature increases, all of them do in the link found and anywhere else.

They both have practically same viscosity at 100 degree Celcius, hence both are 30 grade.

But at 0 degree Celcius, 0W30 has lower viscosity than straight 30 oil.
It acts more like a lower viscosity oil at low temperature. This doesn't mean it thickens as temperature increases. It means thins less as temperature increases vs a single grade oil of same viscosity at low temperature.

Also single and multi grade oil thinning characteristic at high temperatures become more or less same looking at the oil viscosity vs temperature curves available online. Meaning from 100 celcius to 110 celcius both single and multi grade oil will lose viscosity more or less same amount if they have same high temperature grade.

[STR8-6IX]

you never want your temps to go over 240. 240+ is creeping into track temperatures. I would reccomend that you remove your plastic engine cover and use 5w-40 for your next oil change. these two together made my temps alot more reasonable