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The BMW Range
5 Series
E39
BMW Long Life Transmission Oil for M54 engine
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<blockquote data-quote="vinode" data-source="post: 167173" data-attributes="member: 671"><p>I am a "part-time" tribologist with a power plant and this "life-time" lubrication ideology is intriguing to say the least. We know the functions of the gear oil, as mentioned by funfer_fahrer, and due to this function it is bound to collect (maybe dirt is not the right word) particles and impurities inside the oil, becoming a sludge. Imagine your clutch plate thinning, where does all that metal go to? This will cause inherent change to the oil properties and by "lifetime" oil, what the Bavarians have done is create oil that can withstand the property change or rather blend it in with the system, meaning the oil gets better with impurities (after all, you can change boiling properties of water with salt, an impurity). Comprende? </p><p>But then how much impurity can it take? What will happen to the filter? What will large metal particles do to the moving parts? What is "lifetime" (or whose)? Also, years of working with lawyers and contracts, "lifetime" is subjective. We have fire retardant hydraulic oil used in a steam turbine system which can last 10years. How do we know it's time for a change? OIL ANALYSIS. That's right, no guess work when a 10 million RM equipment is involved. Acid number, Tan number, H2O and Oxides in the oil determine it's useful life. In one instance, the topping up helps... maybe even drain some and top up just to "dilute" it if you will. But all that to save RM100K in oil. BMW ZF ATF is much cheaper. Cheaper even than sending the oil for analysis. I am about to change mine this weekend because I believe the new oil is not detrimental, though the degraded 5 year old oil may be (just the tribologist in me speaking). Who knows, maybe I can extend my gearbox by another "lifetime". But then again every time I open the gearbox oil sump up, who knows what is getting IN to the oil, how good is the new oil, is everything tightened back the way it should be etc?</p><p>I'm not writing to say whichever method is better but at least we can feel better doing either. If the ATF is a "lifetime" oil, the Bavarians won't be selling the oil now, would they? vbmenu_register("postmenu_147247", true); </p><p> vbmenu_register("postmenu_147247", true);</p></blockquote><p></p>
[QUOTE="vinode, post: 167173, member: 671"] I am a "part-time" tribologist with a power plant and this "life-time" lubrication ideology is intriguing to say the least. We know the functions of the gear oil, as mentioned by funfer_fahrer, and due to this function it is bound to collect (maybe dirt is not the right word) particles and impurities inside the oil, becoming a sludge. Imagine your clutch plate thinning, where does all that metal go to? This will cause inherent change to the oil properties and by "lifetime" oil, what the Bavarians have done is create oil that can withstand the property change or rather blend it in with the system, meaning the oil gets better with impurities (after all, you can change boiling properties of water with salt, an impurity). Comprende? But then how much impurity can it take? What will happen to the filter? What will large metal particles do to the moving parts? What is "lifetime" (or whose)? Also, years of working with lawyers and contracts, "lifetime" is subjective. We have fire retardant hydraulic oil used in a steam turbine system which can last 10years. How do we know it's time for a change? OIL ANALYSIS. That's right, no guess work when a 10 million RM equipment is involved. Acid number, Tan number, H2O and Oxides in the oil determine it's useful life. In one instance, the topping up helps... maybe even drain some and top up just to "dilute" it if you will. But all that to save RM100K in oil. BMW ZF ATF is much cheaper. Cheaper even than sending the oil for analysis. I am about to change mine this weekend because I believe the new oil is not detrimental, though the degraded 5 year old oil may be (just the tribologist in me speaking). Who knows, maybe I can extend my gearbox by another "lifetime". But then again every time I open the gearbox oil sump up, who knows what is getting IN to the oil, how good is the new oil, is everything tightened back the way it should be etc? I'm not writing to say whichever method is better but at least we can feel better doing either. If the ATF is a "lifetime" oil, the Bavarians won't be selling the oil now, would they? vbmenu_register("postmenu_147247", true); vbmenu_register("postmenu_147247", true); [/QUOTE]
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BMW Long Life Transmission Oil for M54 engine
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