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      11-26-2005, 02:21 AM   #36
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Originally Posted by visor
IIRC, there was a thread on this topic earlier. I believe e90fleet mentioned that the N52 engine requires a newly certified longlife synthetic oil that currently only BMW has in North America. Maybe Mercedes has it also.

So, don't substitute non-BMW Castrol or Mobil 1 synthetic as they currently don't meet the requirements yet.

Found the thread:
E90Fleet was referring to the BMW Long Life (LL) 01 specification, which requires an oil with a HT/HS of 3.5 or more. The BMW 5w-30 also meets this requirement as the A3/B3 specs it meets requires a HT/HS of >3.5.

However, there is no need to use such a thick lube in this application...any shear-stable, long-life, 5w-30 synthetic with at least a HT/HS of 3.1 is acceptable and has shown to provide good wear in daily driving conditions. Mobil 1 Extended Performance 5w-30 is a good example. Remember that BMW considers the regular Mobil 1 5w-30 as an acceptable substitute for the BMW 5w-30 oil.

In addition, the LL-01 approved Mobil 1 0w-40 is very overrated. One may think that it is significantly thicker than other oils such as Mobil 1 5w-30 (EP or not), but this isn't true. Mobil 1 0w-40 starts out in the mid-14cst range with an HT/HS of 3.6cp, but shears rapidly during use to a 11.5-12.5cst oil within 5000 miles, and the HT/HS drops to 3.1-3.2 consistently...thus, its has little benefit over a stable 5w-30. Mobil 1 EP 5w-30 would be a better choice as it starts out at 10.6cst (based upon the Virgin Samples I've seen), and thickens slowly during usage but does not thicken out of grade significantly like the BMW 5w-30 does...the M1 EP 5w-30 also has a longer service life due to its higher TBN. (Generally)