Quote:
Originally Posted by Whoopsy
Look, load had nothing to do with the weight of the oil, weight is only a measure of the stickiness of the oil, that's why the high revving engines needs the extra sticky oil in order to stay on the metal parts, lighter oil will get fling off.
Simple experiment for you, grab a stick, dip it in water, than start swinging, does the water stay on? Do the same thing but dip it in honey, does it stay on?
Modern synthetic oil molecules do not break down no matter the load, unlike regular mineral oil, all synthetic oil has the same base unbreakable base molecules, the difference being the additives that's added that separate brands and grade. The additives are mostly detergent that keeps the engine clean.
BMW has specified the minimum API grade fro engine oil, Castrol 10w-60 and the Castrol 5w-30 that the X5/6M engine needs already met and exceed that grade, there is no added benefit of the additional 'additives' in the 10w-60, anyway most of the additional additives in the 10w-60 over the 5w-30 is for extending the viscosity range of the oil, giving it a 50 weight range.
Again, BMW spec the Castrol 10w-60 for the V10, V8, I6 engine only because of the high revving nature of those engines, the extra stickiness is NEEDED. It's has nothing to do with the so called 'extra sophisticated' TWS 10w-60, it's just a myth within the TWS fan club that the TWS is 'better'. BMW could have spec Shell Helix 10w-60 for those engines as well, the Shell is equal if not better than the Castrol, but Castrol was spec-ed only because they had a contract with BMW, nothing more.
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Again, no one is disputing the basic properties of oil here. This post is not about engine oil properties. It's about
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Why variouis BMW service centers are giving out conflicting information on which oil to use?, which you have not been able to answer. I think if was clearly stated in the manual, then there would not have been many of us asking the question on which oil to use. Again, there seems to be a bit of ambiguity in the manaul that are include in the MY 2010 model. The main manual is the generic X6/X5 manual wich states the 30 to 40 weight oil being used. But there is no mention of the type of oil in the M supplemental manual. We have seen various accounts of verbal and visual varifications of both types of oil being filled at service centers. Are we to fully trust our BMW service centers? AGAIN, have you have yours serviced and what did they put into your vehicle? Please remember, many of us did not specificly ask for the TWS when we have our vehicle serviced. It is what the the default is called up for oil service when the service center pull it up on the screen. I would really like to know if my car is getting filled with wrong oil and if so, a verification from BMW. I am sure you feel the same, no?
Hmmm....load does have a bearing (lol...no pun intened) on what type of oil is used. A typical factory Japanese speedbike that revs to 13k redline still calls for a 40 weight oil. It's not just about "high reving". Also to clarify, the term "high reving" is subjective. A MY 2000 BMW M5 revs "only" to 7000 rpm and that vehicle calls for the 10-60 TWS as well. Is that considered a "high reving" car?