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Originally Posted by JCL
Interesting to read about, just wondering how many of us have had an oil-related engine failure on a street car, in the past decade or so.
We should have a new term; us motor-heads can hang together and the oil-heads can line up on the other side of the room. 
Cary, welcome to X5 world in any case, good to have you here 
Jeff |
Thanks for the welcome. Concerning oil failures. This has become an increasingly common problem again. Toyota had to extend their warranty on the 4 cyl and 3.0 V6 motors due to severe sludging in 1999-??? models. VW and Audi have extended their warranty on the 1.8t cars after many of them experience failure due to sludging from dealers not using the properly speced VW 501 oil.
My mechanic has noted that in clients BMW's (they are a independing BMW repair shop) that have followed the 15k interval on the factory Synth that the motors have very noisy valvetrains by 100k and some have had to have the heads rebuilt due to excessive valve guide and drivetrain wear. On the motors that have had an intermediate oil change at about 7500 miles (their recommendatioin), he says they are as tight as a drum.