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      04-15-2020, 05:41 AM   #1
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redline 15w50 ?

Anyone running this? Redline 15w50. Apparently it is thinner but just as shear stable and strong or even stronger as 10w60 from bmw. Any opinions? https://www.bimmerworld.com/Oil-Chan...ilter-Kit.html

25k miles on my 13 m3 and trying to decide what oil to go with. Running bmw 10w60 right now with a bottle of liqui moly ceratec
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      04-15-2020, 05:42 AM   #2
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redline 15w50 ?

Anyone running this? Redline 15w50. Apparently it is thinner but just as shear stable and strong or even stronger as 10w60 from bmw. Any opinions? https://www.bimmerworld.com/Oil-Chan...ilter-Kit.html

25k miles on my 13 m3 and trying to decide what oil to go with. Running bmw 10w60 right now with a bottle of liqui moly ceratec

Thank you!
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      04-15-2020, 06:47 AM   #3
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15w50 is only thinner at operating temp.

If you’re not going with the factory spec then try 5w50.

The last thing we need is another oil thread. Do a search and you’ll find more than enough info.
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      04-15-2020, 06:54 AM   #4
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I don't have the answer, but if you want to research, try to find measurements about oil flow. Thinner oils tend to not reach the correct flow with higher RPM.

There is a member here that always used Mobil 0W40 I think, many miles with no problems.
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      04-15-2020, 08:24 AM   #5
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A thinner oil should reach the correct flow at high rpm as long as the oil pump can keep up and since it is variable flow, it should. I have not read of any pressure or flow problems with any oil. I think the concern is that a thinner oil might not have sufficient film strength at high rpm or that it might thin out. It’s probably a concern only under racing or severe driving conditions, circumstances that apply to only a small percentage of owners even though most of us imagine ourselves to be hard core racers.
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      04-15-2020, 11:19 AM   #6
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Quote:
Originally Posted by pbonsalb View Post
A thinner oil should reach the correct flow at high rpm as long as the oil pump can keep up and since it is variable flow, it should. I have not read of any pressure or flow problems with any oil. I think the concern is that a thinner oil might not have sufficient film strength at high rpm or that it might thin out. It’s probably a concern only under racing or severe driving conditions, circumstances that apply to only a small percentage of owners even though most of us imagine ourselves to be hard core racers.
I have bumper stickers, doesn't that make me a hard core racer? lol : )
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      04-15-2020, 11:24 AM   #7
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Just trying to see if anyone is running the Redline specific 15w50. Bimmerworld.com recommends it for the M3 and show specs of the oil to compare it to the 10w60 Shell/bmw oil. They have some good info. Makes sense to me, going to give it a shot.

here is the link to their kit with a lot of info... [url] https://www.bimmerworld.com/Oil-Change-Package-S65-Red-Line-15W50-OEM-Filter-Kit.html
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      04-15-2020, 11:37 AM   #8
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What's the objective of the choice?
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      04-15-2020, 12:29 PM   #9
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Are you having issues with oil shear? If so, what proof do you have? What's wrong with 10w60? And why do you feel the need to use additives? (Ceratec)

15w50 is going to be thicker at startup and could contribute to extra wear, which is the highest at startup.
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      04-15-2020, 12:34 PM   #10
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why 15w-50 over 5w-50? My understanding is redline doesn't sheer down as much as most other oils so in theory redline 5w-50 might sheer down less than some other brand 10w-60.
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      04-15-2020, 12:38 PM   #11
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Red Line 5W50 is very close in spec to the Castrol TWS 10W60 originally used by BMW. Red Line 15W50 and 5W50 are close to the same oil based on the specs from Red Line's site.

As for flow, the S65 has a variable volume oil pump that maintains a pressure set-point. Oil pumps do not "make" pressure. Oil pumps produce flow. Based on the system dynamics and the oil viscosity, pressure will result. Lower viscosity oil MUST have a higher flow to maintain the same system pressure. The S65 pump is a pretty good one and has been shown to produce good flow at high RPM as long as the bearing clearances are appropriate.

As pbonsalb said, the question is if a thinner oil can withstand shearing at high loading in order to protect from metal-to-metal contact. I am by no means an oil expert, but if I am reading things right, HTHS is a measure of the oils ability to flow while not shearing under load. Higher the number is better.

HTHS numbers:

Castrol TWS 10W60 - 5.2
Castrol Syntec 5W50 - 3.7
Redline 5W50 - 5.0
Redline 15W50 - 5.8
Mobil 1 0W40 - 3.6 (lots of people seem to happily run this oil in the S65)
LM 10W60 - 3.5 (wow - this is low for a 10W60)

So, while the 15W50 does have the highest HTHS, it does not necessarily mean it is a better oil for the S65. If you are really going to be tracking your car a lot, it is likely best to run a proper 50WT or 60WT race oil with very short OCIs as they are not designed for road use.

For daily use, and the odd track day, any quality oil that provides adequate protection against shear at high RPM will be fine.

I have happily run:

Red Line 10W60
Red Line 5W50
Castrol Syntec 5W50
Castrol TWS 10W60
BMW Twin Power 10W60
Liqui Moly 10W60

As long as I can access FCP Euro, I will run Red Line 5W50. If that goes away, then I will likely go back to running Castrol Syntec 5W50.

Cheers,
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      04-15-2020, 01:27 PM   #12
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Another 5W50 to consider is M1 5W50 which is 4.4

I have run
Castrol TWS 10W60
Liqui Moly 10W60
Mobil 1 5W50
Castrol 5W40
Rotella T6 5W40
Mobil 1 0W40

They all work fine. 10W60 cold start cranking is slow at -10F. 0W40 consumption is high. Somewhere in between is probably a good compromise that would work fine for 95% of users.

Next will be a mix of M1 0W40 and 15W50 since I have a bunch of both.
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      04-15-2020, 02:09 PM   #13
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Quote:
Originally Posted by pbonsalb View Post
Another 5W50 to consider is M1 5W50 which is 4.4

I have run
Castrol TWS 10W60
Liqui Moly 10W60
Mobil 1 5W50
Castrol 5W40
Rotella T6 5W40
Mobil 1 0W40

They all work fine. 10W60 cold start cranking is slow at -10F. 0W40 consumption is high. Somewhere in between is probably a good compromise that would work fine for 95% of users.

Next will be a mix of M1 0W40 and 15W50 since I have a bunch of both.
I wonder where in Canada I can get Mobil 5W50 for a good price? It looks like a pretty good option.

Castrol 5W50 is cheap as dirt at Canadian Tire when on sale ($35 for 5L) but I do not think they carry the Mobil 5W50.

Cheers,
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      04-15-2020, 03:07 PM   #14
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I bought it on Amazon last year. Not as cheap as 0W40 or 15W50. I think it was $8/L.
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      04-15-2020, 03:23 PM   #15
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Let's just say that Amazon is not an option for us in Canada for oil... FML

Cheers,
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      04-15-2020, 07:25 PM   #16
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Wow! If you are in Vancouver, do you have friends over the border?

https://www.amazon.com/Mobil-106035-...6996684&sr=8-1
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      04-15-2020, 09:17 PM   #17
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Quote:
Originally Posted by pbonsalb View Post
Wow! If you are in Vancouver, do you have friends over the border?

https://www.amazon.com/Mobil-106035-...6996684&sr=8-1
I am in Victoria and I do have a mailing address in Sumas Washington. So I will look into the amazon link you shared.

Also, I might be able to get it for $9/L at NAPA...

Good to have options just in case my FCP hookup ends cause I cannot afford Red Line 5W50 at $16/Qt...

Thanks!!
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      04-15-2020, 09:42 PM   #18
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Quote:
Originally Posted by jvictormp View Post
I don't have the answer, but if you want to research, try to find measurements about oil flow. Thinner oils tend to not reach the correct flow with higher RPM.

There is a member here that always used Mobil 0W40 I think, many miles with no problems.
There was a YouTube video link posted in the FB group of someone running 0W40 and they blew their engine on the track.
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      04-15-2020, 11:21 PM   #19
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Quote:
Originally Posted by ItsGary View Post
There was a YouTube video link posted in the FB group of someone running 0W40 and they blew their engine on the track.
You cannot blame a blown engine solely on 0W40. Likely just a case of winning the German lotto.

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      04-16-2020, 06:52 AM   #20
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Quote:
Originally Posted by ItsGary View Post
There was a YouTube video link posted in the FB group of someone running 0W40 and they blew their engine on the track.
I thought someone wrote the 0W40 as a joke. There was no mention of 0W40 in the video. There is no history given for the car. Was it rod bearings that were not replaced? Main bearings?

Even if there was 0W40 in the motor on the day it ran in the track, does that mean the engine failed because of the 0W40? Besides, more S65 have failed with 10W60 in them on the track and on the street than with 0W40 in them.

But as I have written many times, I would not be inclined to run 0W40 the track. If you don’t know what you are doing, you should not be doing it. Generally, the drivers of orange cars are the “Hey, look at me” type.
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      04-16-2020, 07:57 AM   #21
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https://540ratblog.wordpress.com/
Nice blog for reading and choosing the oil viscosity. Search there keyword "s65"...
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      04-16-2020, 08:17 AM   #22
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I saw this ad on bimmerworld.com, they sell products exclusively for bmws and have an oil change kit for 15w50, they also explain why they would use this over 10w60. I was intriqued and wonder if anyone else on this forum has ran this redline oil? - https://www.bimmerworld.com/Oil-Chan...ilter-Kit.html
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