[SatinblkF90]

Originally Posted by shawnhayes

I just made this point in another thread, though, for weights, we're discussing very close oils.

A 0W-30 kinematic viscosity at operating temperature is 12.18 mm2/sec.

A 5W-40 kinematic viscosity at operating temperature is 12.8 mm2/sec.

These are very small differences.

Shawn

Just curious does adding additive like ceratec or m0s2 to oil have any impact on viscosity at all?

[shawnhayes]

Originally Posted by SatinblkF90

Just curious does adding additive like ceratec or m0s2 to oil have any impact on viscosity at all?

The answer is "probably", but none of those manufacturers mention it specifically. I've never tested it for certain. Biggest impact would be from the carrier oil for the ceratec.

Shawn

[masonh]

Motul 300V

[F10Mfizzy]

Redline 0w-40

[FJPM]

Originally Posted by micvite

Can we end the oil debate already? Only reason it's 0w-30 in the usa is for emissions, and epa rating most likely. Here's the usa vs German owners manual for a 2021 m5. Only difference is ll01 for usa because we have shitty gas vs ll04 or 12 for Germany because they don't have sulfur in their gas.
Also attached is the 2018 USA owners manual... im sure they totally changed the internals of the car without telling anyone.

Stangly in the french version of the manual they recommend only 0W30 and 12FE...

[NoMods]

tag

[EM5C]

LiquiMoly leichtlauf high tech 5w40 for me. Engine runs notably quieter.

[M5 London]

Originally Posted by EM5C

LiquiMoly leichtlauf high tech 5w40 for me. Engine runs notably quieter.

Due to greater 'drag'...

[pbonsalb]

Older manuals for S63 motors specified 0W30, 5W30, 0W40, 5W40. Any are fine. You get the best fuel economy with the thinnest oil. BMW could not care less what happens to you motor out of warranty. Sometimes it seems like they could care less what happens while it is under warranty.

If you are a sheep, follow the manual precisely. Your transmission fluid is lifetime — please don’t change it even if ZF says you should…. Don’t change your coolant, either.

[hunter8793]

Originally Posted by pbonsalb

Older manuals for S63 motors specified 0W30, 5W30, 0W40, 5W40. Any are fine. You get the best fuel economy with the thinnest oil. BMW could not care less what happens to you motor out of warranty. Sometimes it seems like they could care less what happens while it is under warranty.

If you are a sheep, follow the manual precisely. Your transmission fluid is lifetime — please don’t change it even if ZF says you should…. Don’t change your coolant, either.

Sweet, thats sarcasm regarding the coolant and trans fluid right?

[pbonsalb]

Yes … but do your own research and maintain your car the way that makes you comfortable. Your car is not my car and it makes no difference to me what you do. I just want people to be open minded and learn more and then make a decision, even if it is contrary to what BMW writes. Bobistheoilguy is a great place to learn about oil.

[PDOT]

Originally Posted by pbonsalb

Older manuals for S63 motors specified 0W30, 5W30, 0W40, 5W40. Any are fine. You get the best fuel economy with the thinnest oil. BMW could not care less what happens to you motor out of warranty. Sometimes it seems like they could care less what happens while it is under warranty.

If you are a sheep, follow the manual precisely. Your transmission fluid is lifetime — please don’t change it even if ZF says you should…. Don’t change your coolant, either.

How often should the coolant be flushed.

[pbonsalb]

I don’t know. 50k miles? 75k miles? 100k miles? I have 50k miles and am about to do the transmission, but think I will wait on the coolant until maybe 60k or more. Age may be a factor also — my car is about 6 years old and I’d be inclined to change it by 8 years. I don’t have all the answers. I just don’t agree with never changing a fluid.

[shawnhayes]

Originally Posted by PDOT

How often should the coolant be flushed.

If it hasn't been opened, the only problem is contaminants from the system itself. Old fashioned hoses would begin to crumble into the coolant, and corrosion would seep into the coolant.

No one really knows anymore, but the 8 year interval is a pretty good check. Only costs money and time.

Shawn

[Tuner1]

Originally Posted by shawnhayes

I just made this point in another thread, though, for weights, we're discussing very close oils.

A 0W-30 kinematic viscosity at operating temperature is 12.18 mm2/sec.

A 5W-40 kinematic viscosity at operating temperature is 12.8 mm2/sec.

These are very small differences.

Shawn

This information is misleading. Depending on which 0W-30 and 0W-40 is compared there can be a large difference in the viscosity at operating temperature.

SAE 30 is between 9.3 - 12.4 cSt @ 100C

SAE 40 is between 12.5 - 16.2 cSt @ 100C

I would be willing to be that most LL-01FE approved oils are well below 12.4 cSt @ 100C.

[shawnhayes]

Originally Posted by Tuner1

This information is misleading. Depending on which 0W-30 and 0W-40 is compared there can be a large difference in the viscosity at operating temperature.

SAE 30 is between 9.3 - 12.4 cSt @ 100C

SAE 40 is between 12.5 - 16.2 cSt @ 100C

I would be willing to be that most LL-01FE approved oils are well below 12.4 cSt @ 100C.

While that CAN be true, that’s a theoretical. 100C is below the operating oil temp of most petrol engines.

And SAE 30 and SAE 40 are basically irrelevant. They aren’t multi viscosity oils and aren’t approved or really used for practical street purposes. Race, sure, but that’s not what we do.

By all means, please illustrate. Although I will accept that most LL-01FE oils are below 12.4 cST at operating temperature. But feel free. My point is that arguments about this are not really relevant. 0w-30’s and 0W-40’s just aren’t that much different in real usage. They are different but not that much.

Shawn

[pbonsalb]

Everything I have read supports what Tuner1 wrote — there is a significant variation among brands/modeks within a weight class. Significant enough that a 0W30 might indeed be close to a 0W40 depending on the brands/models compared, and also significant enough that they could be really far apart. This is regularly discussed in Bobistheoilguy.

The engine oil operating temperature in my 2018 F90 appears on the gauge to always be well over 100C. I need to use a scan tool to verify actual temp. Others have reported it is lower than indicated. But absent that verification, it seems to me these cars run hot, at least in efficient mode in daily driving. I have read that Sport Plus triggers additional cooling but do not fully understand the mechanism and whether it is for coolant or oil or both.

FE is fuel economy oil. I would expect it to be thin. You do not need to use it unless you want maximum fuel economy or are concerned about warranty claims. BMW is not specifying it because the engine requires it, but rather to help meet CAFE standards.

[shawnhayes]

While I appreciate this, in the GT-R community, the oil cooling and transmission cooling was garbage. We spent probably a million dollars compiling oil analyses work trying to find the best oil.

After all that, the factory Mobil-1 0w-40 was just fine, unless you were hard tracking and hadn’t done aftermarket cooling.

And we learned that, for the most part, oil choice was a difference that didn’t make a difference unless you were way out of near the original spec.

Shawn

[NoMods]

just did a change over the weekend, i used LiquiMoly 5w-30 LL, 10 liters