What oil?

[Advorsor]

Yes, it still shears from what I read, but not as much as it used to like 15 years ago is my impression. It also is fairly light to begin with, for a 60 weight.



What about what? I wouldn't run a 5w40.

I just find it interesting on Bimmerworld that they recommend it for Cold Temps in S54

[/M3]

Motul 10w60.

Ran German Castrol 0w40 with no issues for many years, since I was running it on my E38 as well, I gave it a try. Engine temps were always cool. Never tracked but driven hard.

[simonnim]

liqui moly 10-60, used on my track duty E60 M5 also.

[Tbonem3]

In what sense?

I know it used to shear down into the xW-40 range in service. Does it still? I remember doing some digging on this a few years ago and came to the conclusion that (then-)current formulations basically never sheared past the xW-50 range (min. 16.3 cSt @ 100º C).

Yes, it still shears from what I read, but not as much as it used to like 15 years ago is my impression. It also is fairly light to begin with, for a 60 weight.

What about 5W40 vs 10W60 then?

What about what? I wouldn't run a 5w40.

[Advorsor]

*PSA*

Talking about oil weights by using terms like 5w50 or 10w60 is almost useless. Just like tires - A 265 Michelin PS4S can be wider than some ling ling 275 tire.

Castrol TWS is called a 10w60, but it acts like a heavy duty 40 weight from my research. Then there's something like Liqui-moly 10w60 with a CST of 26+ at 100degress, which is about the highest I've ever seen, much higher than castrol or other 10w60s.

The "redline 5w50 instead of castrol 10w60" argument for S54/s65/s85 has gotten popular, but is redline lighter than castrol?

Well, 1st formula of redline had HTHSV rating of 5.9, newer formula is 5.0. Castrol is 5.3! Barely any difference. "ReDlInE is bEtTer in the CoLd!" Well, RL 5w50 has a cold pour of -45 and Castrol's is -39 so no.

Viscosity, Kinematic 100°C of Redline is 21, Castrol is 22.7, almost no difference.

You cannot conclude that redline is better for cold starts than Castrol just because Redline says 5w50 on the bottle and Castrol says 10w60.

Haven't even discussed additives. Perhaps Redline is low on additives because their product is meant for race cars. So even if redline and castrol were neck and neck in terms of viscosity and resulting oil pressure etc, Castrol could still be a better choice for most (Street cars) due to better/more additives.

Or maybe you have cats and don't want a race oil high in ZDDP? Castrol has other anti-wear properties that don't damage cats.

What about 5W40 vs 10W60 then?

[IamFODI]

Castrol TWS is called a 10w60, but it acts like a heavy duty 40 weight from my research.

In what sense?

I know it used to shear down into the xW-40 range in service. Does it still? I remember doing some digging on this a few years ago and came to the conclusion that (then-)current formulations basically never sheared past the xW-50 range (min. 16.3 cSt @ 100º C).

[Feffman]

My 10W-60 oil spreadsheet.

Feff

[Tbonem3]

*PSA*

Talking about oil weights by using terms like 5w50 or 10w60 is almost useless. Just like tires - A 265 Michelin PS4S can be wider than some ling ling 275 tire.

Castrol TWS is called a 10w60, but it acts like a heavy duty 40 weight from my research. Then there's something like Liqui-moly 10w60 with a CST of 26+ at 100degress, which is about the highest I've ever seen, much higher than castrol or other 10w60s.

The "redline 5w50 instead of castrol 10w60" argument for S54/s65/s85 has gotten popular, but is redline lighter than castrol?

Well, 1st formula of redline had HTHSV rating of 5.9, newer formula is 5.0. Castrol is 5.3! Barely any difference. "ReDlInE is bEtTer in the CoLd!" Well, RL 5w50 has a cold pour of -45 and Castrol's is -39 so no.

Viscosity, Kinematic 100°C of Redline is 21, Castrol is 22.7, almost no difference.

You cannot conclude that redline is better for cold starts than Castrol just because Redline says 5w50 on the bottle and Castrol says 10w60.

Haven't even discussed additives. Perhaps Redline is low on additives because their product is meant for race cars. So even if redline and castrol were neck and neck in terms of viscosity and resulting oil pressure etc, Castrol could still be a better choice for most (Street cars) due to better/more additives.

Or maybe you have cats and don't want a race oil high in ZDDP? Castrol has other anti-wear properties that don't damage cats.

[enjoy_m3]

Already replaced it

Is it coming from the front of the engine? Could be the vanos rattle. I'm running lucas 5w50 on my street (convertible daily). Warms up quicker, no issues with oil temp, no noises, and no oil consumption. Car is mostly a cruiser though.

(I stand corrected by tbone)

[ac427]

Motul 300V 10W40

[Advorsor]

Idle control valve, clean it.

Already replaced it

[CrisSilberGrau]

Its always very loud and the revs fluctuate the first couple of second (30s tops) before it settles.

Idle control valve, clean it.

[IamFODI]

I’ll continue to investigate but those first 30 seconds or so are definitely more pronounced in the Winter months.

What kind of noise is it? Might be worth posting a separate thread.

[maupineda]

5w50 is the best compromise in my opinion. For a regular usage car, is best to have an oil that makes the engine run cooler and allows better flow during cold starts. 60 grade oil comes in need when wringing the car much and in hot conditions, other than that is overkill and perhaps more detrimental than not.

[EthanolTurbo]

Has anyone run Valvoline VR1 consistently and had a good experience? Was thinking 5w50. It's high in zinc, seems just right for an S54.