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      03-29-2011, 08:24 PM   #40
Glina
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Drives: 17 M3 ZCP
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Quote:
Originally Posted by itsme123 View Post
Ok here we go. Load, where do we start. A good example is a desiel engine for commercial trucks which is a low rpm high load motor. Motors such as this will need a higher grade motor oil because of the load that it takes through out the crank/main bearing area. What is an indication of good quality oil? Not just viscosity. Also the shear rating of the oil. A high load motor needs an oil that can withstand the the load where the shear rate of the oil is pushed to the limit. Imagine a combustion that is happening in a 5.0 liter motor, a 7.0 liter motor and a 1.0 liter motor. All operating at say a set RPM of 5000 RPM. Are you going to get the same "load" at the main bearing between the different motors? NO. It's not just about the viscosity of oil. Many many factors goes into making an oil. The same rated viscosity oil (say 10w-30) from Castrol of different grade can act very different in the specified condition. Just as there is a difference in quality between brands of the same rated viscosity because of how it's engineered to a specific purpose.

I called BMW NA earlier, 800-831-1117. Spoke to a representative named Fred and asked him what motor oil is recommended for MY 2010 X6M. He took about 15-20 seconds to look it up on his end and replied BMW TWS 10w-60. I repeated 10W-60 three times and he emphaticlly said yes. I then proceeded to tell him that the S63 motor is different then the previous M motors and asked him to double check and he said its the 10W-60. He then asked me again to make sure I am not refering to the S62 motor which had an exception and I said it's the S63. He said the only time any other grades of synthetic oil can be used is for emergency top off where the 10w60 is not available. Please someone else call and verify. For all I know, you may get a different answer, but this is what I got.
Here is your oil 10W60. End of story.
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