Quote:
Originally Posted by edycol
OMG.
First of all, there is no such thing as difference between lubrication between 30 or 40 weight. BMW , as well as other manufacturers don't care about weight at 100c or Kinematic Viscosity at 100c (KV100). They care about High Temperature/High Shear (HTHS) which is resistance of oil to temporary or permanent loss of viscosity. In case of LL01 which that Liqui Moly is, minimum HTHS is 3.5. LL01 can be both 5W30 or 5W40 as long as HTHS is minimum 3.5cP.
Now, that particular Liqui Moly (well, in general Liqui Moly) is mediocre oil. For example Mobil1 0W40 is known to be consumed by BMW engines, but it is absolutely state of the art oil that Liqui Moly doesn't have nor will have in their line up. Some oils get lost in engines, some don't. Some engines don't use certain oil, some oil get used.
I personally would stay from BMW TPT 0W30 bcs. it is LL01 FE oil, with minimum HTHS of 3. But their 5W30 stuff is definitely more robust than Liqui Moly 5W40. Reason is that it has to be minimum HTHS 3.5 but KV100 is actually very thin at 11cst. That means that they had to use extremely sophisticated base stocks to achieve that. Liqui Moly on other hand uses simple Group III base stocks and KV100 is actually very high for such HTHS.
There are numerous oils that I would use before Liqui Moly, all available in Wal Mart or Auto Zone, AAP.
As for Ceratec or whatever garbage, it is disturbing additive package of oil. Oils are carefully blended combination of base stocks, chain polymers (cheap oils=liqui moly) or star polymers (HPL, some Mobil1 and Castrol, some Shell/Pennzoil, Redline etc.) and additives. When you add additives you are disturbing that in unknown way. Are you increasing oxidation? Are you increasing evaporation loss (Noack)? You have no idea. And here is a thing: why Liqui Moly needs additives if their oils are good? Why Mobil1 doesn't sell you that? Or Castrol?
Stick to approved oils, and actually for $18 on Wal Mart web site you can get Wuaker State Euro 5W40 for $18 for 5qt which is repackaged Pennzoil Platinum Euro 5W40, one of the best oils out there, approved for LL01.
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Definitely didn't want to turn this into one of those "oil debate threads" but I should have known better. It's truly amazing how many oil scientists own BMW's.
You are the first person (including other oil scientist owners) that I've heard say Liqui Moly was cheap or inadequate oil, so I'll take it with a grain of salt. Castrol makes BMW oil.