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Old 02-12-2013, 08:46 AM
upallnight upallnight is offline
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Originally Posted by Raimo View Post
The person asked about oil separator, which is a M62 problem. You answered about N62 and another problem. Doesn't make sense, does it?

Also, The N62 "misfire" has nothing to do with cold and it is not the problem, it is the result. The problem is excessive wear in Valvetronic parts which eventually cannot open valves correctly. There is also another problem on some N62 engines where valve stem seals fail prematurely, this can be identified by blue smoke when idling. In general, the problem is only a result of uneven quality of the parts from the manufacturer side AND _STUPID_ first owners believing that 30k km oil change intervals are ok. Cars which have had oil changes after 10-15k km rarely have these problems. A thoroughly check will show wheter these problems are present or not. If their not present after 135k km, then it is unlikely they will occur when taken proper care.
The M62 CCV problem is also not unsolvable, but it requires some previous experience to solve it.
The original poster asked about his 2005 BMW X5 V8 which make it a N62 engine not a M62 engine.

Originally Posted by Raimo View Post
There IS NO oil separator problem with N62. It applies only to M62.
N62 was first introduced on E53 in 09/2003. So post 09/2003 you are fine, although 24-points test (or whatever it is called there) is strongly advised to verify that VALVETRONIC (ie the so called "misfire") parts do not have excessive wear.
135k km is still a low mileage in this case, so if the test verify that VALVETRONIC is ok, you're fine.

Most N62 engines run fine around here with yearly temps between +30C to -30C.
Misfires in an N62 engine due to intermediate levers that are out of tolerance is more noticeable in cold weather because cold weather exacerbate the out of tolerance of the intermediate levers.

Last edited by upallnight; 02-12-2013 at 08:51 AM.
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