Anyone want to explain VANOS?

[Kaan]

To expand on Justin's oh-so-eloquent statement, it's variable valve timing for BMW motarzz, yo. It was introduced in 1993 on the M50 motor. The M50 is either an M50B25 (pre-93) or an M50B25TU (93+). The "TU" stands for Technical Update and TU = Vanos. From there on out, a lot of their newer motors got Vanos when they were refreshed. The 3/5 series badged as a 2.3L or 2.8L (323, 328, 528) is an M50 that's been tuned slightly differently for more/less power (and by "tune" I mean more than just a chip, tweaked might be better word choice).

I don't know what goes into fixing Vanos, or what the common issues are really. I know there are rebuild kits. Oil runs through the solenoid for it, so I guess there's a seal in there that can need replacing.

Oil/solenoid + variable valve timing? das ist vtec. i hate when vtec is broken!