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Old 10-08-2011, 12:16 PM
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Jason5driver Jason5driver is online now
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Mein Auto: E39 hamster w/ pin-wheel
Originally Posted by Newbie528 View Post
Since we have many highly knowledgable oil gurus here, I thought I'll ask 2 questions ~

1. I have seen many photos posted here of Mobil1 5-30W. Many people mentioned the Mobil1 5-30W also.... BUT it's not LL-01 approved. There's no LL-01 mentioned on it. The Mobil1 0-40W is LL-01 approved, however. So, why we have so many guys who encourage the "approved" BMW oil, say Mobil1 5-30W is a good choice? (It is however, Corvette recommended, so I guess good enough for BMW too, but not LL-01 mentioned)

2. I have put 0-20W (full synthetic) recently. I know it's not the right viscosity recommended. But I needed to change oil quickly, because the old oil was getting dirty. I intend to run this oil for only 2K miles or so. I figured this will also flush the engine, and will go back to 5-30W. Is that bad for the car? (by the way I'm getting better gas mileage with it. Getting 23.5 MPG, before 21-22 mpg) I intend to go back to 5-30W, but now not sure if I should use the Mobil1 5-30W (full synthetic, since it's not LL-01 approved). Castrol 5-30W European is hard to find.

What are you views on the mentioned concerns?!!! Thanks in advance!
I would use the Castrol 5w-40, or the Mobil 1 5w-40, or Mobil 1 0w-40 before using the Mobil 1 5w-30.

Castrol 0w-30 is close to 0w-40, and is LL01, which is good.
There is NO way I would use a 0w-20 in these cars, no way.
20 weight is no where near the 30 weight you need for your E39.
IMO, 0w-20 is only out there because of the governments BS of trying to run more efficient cars.

Last edited by Jason5driver; 10-08-2011 at 02:46 PM.
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