What oil?

[Advorsor]

Idle control valve, clean it.

Already replaced it

[ac427]

Motul 300V 10W40

[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)

[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.

[Feffman]

My 10W-60 oil spreadsheet.

Feff

[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).

[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?

[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.

[simonnim]

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

[/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.

[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