frischmoutt <firstname.lastname@example.org> wrote: > >Until mid 2008, my BMW dealer used to put Castrol oil (SAE 5W30 LL04) in >my Z3 (M54 Engine). >Before last November, BMW rationalized their stocks, restricting the >varieties. >At the last Oil Service, they put a thinner oil, rebranded "Original BMW >Quality Longlife-04 SAE 5W-30", made in Germany exclusively for BMW AG... >Basically it's the same quality level but more fluid in hot temps. If it's 5W-30, it's 5W-30. It _has_ to meet a specific viscosity curve and the temperature at the two points in the curve _have_ to be the same. So it's not really thinner oil, although the base oil might be thinner. >The result is that the oil consumption increased from 0.32 to 0.57 l/1000 km >(when new it was 0.28 l/1000). Although the car had 132 000 km on it, >immediately after the oil service, It began to burn oil. Now, the black >deposit at the exhaust is quite solid, barely hard to be removed. >Appearently no leak, at least no stain on the garage floor tiles. >I always had a rather high oil consumption with my different BMWs, mainly >because I'm heavily using engine braking but it's not the reason of the >sudden increase. I suspect that the viscosity of this new oil is the first >thing to focus on. The viscosity is the same as of the old oil. >The questions are: >- Although BMW doesn't recommends 10W-60 (reserved to the M3s), does anybody >have feedback using this grade in his M54 ? >- Besides the price effect on the wallet thickness, what would be the >drawbacks, especially at very low temperatures (0°c) ? Uh! I'm living on the >French Riviera ;-) Why not try using the Castrol LL04 again? Get a case of it, take it to the dealer, ask him to use it when he changes the oil. He should give a substantial discount for letting you provide the oil yourself. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis."