Why would BMW recommend...

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...two different oil viscosities for an engine? The manual states that 5w30 or 5w-40 is acceptable in all temperature ranges. Is this standard practice for other manufacturers too? What would you choose in this circumstance? For the record I have run QS 5w-40 euro in the past and now GC. I am curious to know why they wouldn't just recommend one.
 
They dont just recommend "just one" either is acceptable.

Why not be happy with options? If you look at a lot of manuals they actually recommened several weights depending on temp.
 
Originally Posted By: Hessen
Why would BMW recommend. two different oil viscosities for an engine?

Because there are other, more important specs of the oil than just a viscosity grade, for example, HT/HS. BMW LL oils require that the HT/HS be at least 3.5, and such value can be achieved by both Xw-40 as well as Xw-30 oils, but not just any run of the mill Xw-40 or Xw-30.
 
Originally Posted By: Quattro Pete
Originally Posted By: Hessen
Why would BMW recommend. two different oil viscosities for an engine?

Because there are other, more important specs of the oil than just a viscosity grade, for example, HT/HS. BMW LL oils require that the HT/HS be at least 3.5, and such value can be achieved by both Xw-40 as well as Xw-30 oils, but not just any run of the mill Xw-40 or Xw-30.


This.

Found a walmart that still carries M1 0w-40, so I bought them all. $6.27/qt.
 
Well they are consistent about the cold number.

Once upon a time, car manuals gave a chart listing temperature ranges for different grades of oil you could use. Seems they listed about everything from SAE 20 to 20w50.
 
Originally Posted By: Trajan

Found a walmart that still carries M1 0w-40, so I bought them all. $6.27/qt.

Cool. O'Rileys near me had a promotion on M1 last month, so I picked up some 0w-40 for the Benz at $4.99/qt.
 
Originally Posted By: Quattro Pete
Originally Posted By: Trajan

Found a walmart that still carries M1 0w-40, so I bought them all. $6.27/qt.

Cool. O'Rileys near me had a promotion on M1 last month, so I picked up some 0w-40 for the Benz at $4.99/qt.


Even better.
 
Originally Posted By: SrDriver
Originally Posted By: Johnny
Oh those crazy Germans.


Just think where Wisconsin would be without Bratwurst & Beer.

Don't sound crazy to me!


There's always the cheese.
 
Originally Posted By: StrateLOSS
Trajan I was at a walmart yesterday and they had the 0w40 in 5qt jug for $21.

Are you 100% sure about that? I wasn't aware of M1 0w-40 being available in jugs, only 1qt bottles.
 
Originally Posted By: Hessen
...two different oil viscosities for an engine? The manual states that 5w30 or 5w-40 is acceptable in all temperature ranges. Is this standard practice for other manufacturers too? What would you choose in this circumstance? For the record I have run QS 5w-40 euro in the past and now GC. I am curious to know why they wouldn't just recommend one.


Likey because it's not going to make much difference either way. I would use the GC
 
Originally Posted By: StrateLOSS
yea Im certain of it. I only passed on it because it was SL rated...


That doesn't add up. M1 0W40 has been SM for some time now, and availability in 5L jugs would be a *new* development.
 
Originally Posted By: Trajan
Originally Posted By: SrDriver
Originally Posted By: Johnny
Oh those crazy Germans.


Just think where Wisconsin would be without Bratwurst & Beer.

Don't sound crazy to me!


There's always the cheese.


Without Bratwurst, Beer, and Cheese I would leave the state as there would be no reason to stay in "The Frozen Tundra"
 
Im assuring you, Mobil1 0w40 was in 5qt jugs at walmart. I had 2 jugs in my hand, reading the back and comparing it to 15w50.

and it was SL rated... This was yesterday.
 
Mobil 1 0W40 does have 1100ppm zinc but I think is now SM/CF and 15w50 is SM/SL. Neither is GF-4 of course. Maybe it was old stock?
 
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