BMW M5 Oil Recommendation

[The Critic]

"Given that Castrol developed this oil for BMW Motorsport, I feel confident the oil will perform as intended in the proper application."

I don't disagree that the oil will do its job...my original post was regarding the oil's ability to STAY IN GRADE. At no point did I question the Castrol 10w-60's ability to do its job in protecting the engine.

BTW, I went to bimmerfest to look up some used oil analysis. There are MANY used oil analysis contained in these two threads:
1) http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=3;t=003022

2) http://www.bimmerfest.com/forums/showthread.php?t=37258&page=1&pp=25&highlight=Oil+Analysis+Results

On average, the oils were run between 1000-5000 miles, and the viscosity stayed in the mid-upper 50wt range. In that case, one may as well use a stable, 20w-50 such Amsoil Series 2000 once out-of-warranty.

 

[moribundman]

So you're obesessed with "oil shearing out of grade," huh? Well, I'm obsessed with HTHS.

I am now convinced that Castrol and BMW are just waiting for Michael Wan's input regarding the importance of oil not shearing.

 

[The Critic]

"Well, I'm obsessed with HTHS."

Sure, I'll give it to you that you're obscessed with HT/HS. However, if I were to take Mobil 1 0w-40 and tested in its virgin state, it would be of a mid-40wt and have a HT/HS of 3.5. Say the EOT viscosity is around 12.5, would the HT/HS still be the same?

 

[pscholte]

I'm obsessed with oil made by Elves...

........too many oils are made by.........................people!

 

[moribundman]

Michael, Mobil 1 0W-40's HTHS is 3.6.

As for your question, specifically in regard to Mobil 1 0w40 and other A3-rated oils, they are universally accepted as "stable, stay-in-grade" oils for the intended OCI in the proper application:

A3: Stable, stay-in-grade oil intended for use in high performance gasoline engines and / or for extended drain intervals where specified by the engine manufacturer, and / or for year-round use of low viscosity oils, and/or for severe operating conditions as defined by the engine manufacturer.

 

[The Critic]

"Michael, Mobil 1 0W-40's HTHS is 3.6. "
I stand corrected...thanks for the update.

"As for your question, specifically in regard to Mobil 1 0w40 and other A3-rated oils, they are universally accepted as "stable, stay-in-grade" oils for the intended OCI in the proper application"

I wouldn't disagree that they do their job well "enough" for the intended application, but I do not agree that they stay in grade well enough, for an application that for whatever reason, requires a stable 40wt at all times. I don't disagree that a upper 30wt-lower 40wt is sufficient for these apps, what worries me are people who use Mobil 1 0w-40 in an application that requires a solid 40wt throughout the drain.

 

[moribundman]

quote:

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I don't disagree that a upper 30wt-lower 40wt is sufficient for these apps, what worries me are people who use Mobil 1 0w-40 in an application that requires a solid 40wt throughout the drain.

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Michael, I'm more worried about you again telling a guy to use a a low-HTHS oil in a regular HTHS application than I'm worried about someone's oil possible shearing somewhat. Do you think the carmakers are not aware of an oil's properties before they certify it? Of course, that won't matter if you use non-carmaker-approved oil like AMSOIL.

 

[The Critic]

"Michael, I'm more worried about you again telling a guy to use a a low-HTHS oil in a regular HTHS application than I'm worried about someone's oil possible shearing somewhat."

Mori, that was a one-time error that occur. Such misinformation happens regularly here on BITOG, so I really don't understand why you seem to be singling me out on this one....IF the person had indeed used a 503.00 lubricant, I seriously doubt any damage would occur. A 503.00 could've have thickened up during the drain, while a 503.01 could've thinned.

FYI, I didn't tell the person anything until the outcome of the thread...good thing you pointed it out. I check with BITOG before I tell the person, not the other way around.

 

[moribundman]

quote:

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Such misinformation happens regularly here on BITOG...I check with BITOG before I tell the person

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You simply don't get it. Go on, keep spreading misinformation and opinions as fact. What do I care?

 

[AndyH]

quote:

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Originally posted by the_oil_dealer:
lol i like how thety recommend 5w30 and then jump way up to 10w-60, *** is that about?

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The 10W-60 was spec'd for the earlier M5's. Then starting in 03/2000 BMW incorporated redesigned piston rings in the M5's engine which allowed the use of the BMW 5w30 oil.

 

[Winston]

I think it really depends on how he drives the car. If he never really gets the oil heated up there is no reason to use 10W60. Plus if he uses it for a lot of short trips it would increase his startup wear. On the other hand I would never use Mobil 1 5W30, as noted it is a very thin oil. Dealers often do strange things to cut costs.

As we have seen here, german cars like a thicker oil. If it is a daily driver just pick a nice medium weight oil. Mobil 1 0W40 or 5W40. or GC. If he goes to the track, put in 10W60 for the day and take it out when done.

I think you are being a bit tough on MW. However, I do not think it is significant that the 10W60 will not stay in grade.

 

[Tim]

FWIW - I asked Redline to recommend one of their oils, and they said go with the 5w30 (HTHS of 3.8).

I suspect they answered this way just so as to not contradict BMW.

Tim

 

[the_oil_dealer]

lol i like how thety recommend 5w30 and then jump way up to 10w-60, *** is that about?