I've looked at the DIY for the vanos seal upgrade. I'm up for it, but looks like it will take me a day and a half so I'd rather only do it if I could first know that the engine needs it.
I've just bought the car. 2003 530i touring, WBADS62040GL81691. Has 147,000 km, and (apart from the thermostat obviously needing replacing as the gauge went down to quarter mark on downhill runs) it drove like a charm from Auckland to Wellington and did about 11.5km/L for the trip (I drove with the slipper down a few times too). The idle is smooth and consistent, what looks like 650 or 700 rpm according to the tacho. Seems to have good pull right through the rev range. I've never driven another so have nothing to compare it with but it feels like 170kw to me. Even with 250kg of family and dog in the car it still overtakes effortlessly. I can't hear any obvious loud rattling sounds coming from the vanos area.
Would you guys do this upgrade anyway? Any more precise ways to find out if it needs it? Previous owner didn't do it, but who knows if the one before him did it. Car was imported in 2010 from Japan with 80,000km.
Thanks in advance for any replies.