Hello Pete, Floyd, Scott, BFD853,
I throughly read all the information that you guys provided the past days and followed your recommendations.
I read about the breather valve on a forum (I think that it's the same as you're speaking about), it's connected to the base of the oil gauge tube. The guy said that he replaced it (and a procedure is provided) withourt any major improvement. Of course it's not a reference ! For the moment I didn't consider it since the oil consumption increase coincidates with the new oil service made with 5W-30 and the work needing to be performed is rather consequent. I'll do it in a second attempt if the oil consumption doesn't get back within the rails. I've numerous figures to compare to because I'm a kind of paranoid, monitoring oil consumption since 0 km.
Concerning the oil, I definately abandoned the idea to use 10W-60. I did a search on google and found several possibilities for 0W-40 & 5W-40.. Considering some facts, and as already pointed out in a previous message you sent, I'm wondering if LL-04 is really necessary: The car has been built in Aug. 2001, it's not a diesel, in consequence, I may assume that LL-01 grade could be used, although today BMW specifies LL-04. LL-04 has been developped for diesels engines and may also be used in gas engines. LL-01 satisfies current BMW's needs. So, the reply looks to be "No". OTOH, in 2007/2008 the BMW dealer even put 5W-40 Labo Carat and in
2008/2009, 5W-40 Castrol TXT Softec that both were LL98 specified !
Mobil-1 0W-40 looks to be a good deal, however my fear concerns the hydraulic tappets that might get noisy until the engine is warm enough. For an analog reason (clearances due to wearing) I also fear a loss of oil pressure in cold. => Any advise please ? I had this issue with my old E30 (180000 km), I tried all sorts of oils/viscosities and did not manage to cure it. Not worth to replace the tappets, I left them clicking until I sold it.
For Floyd's information, about the LL-04 oil in the US, I read that it has some bad reaction with the ethanol and may causes problems. For this reason BMW wouldn't recommend it outside Europe
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Best regards