When I went to change my coolant last week I had the non-BMW coolant (green stuff) I noted some of the buildups you all were talking about, spent more than hour trying to flush it out. But, I was still a bit afraid that any leftover residue would not mix well with the BMW coolant, so Im sticking with the green stuff for now.
Maybe Im a bit overconcerned with the mixing there..... but as long as you change your coolant yearly, don't mix, and used distilled war I don't think you will every have a problem with the green stuff.
1996- BMW 328IS
<img src='http://img.photobucket.com/albums/v242/gws226/TEX/neverleanedsig.jpg' border='0' alt='user posted image' />
Performance: Zimmerman Cross Drilled Rotors-- PBR Deluxes-- Cosmos CAI---- Turner Pulley Kit--- Fan Delete mod---
Beauty: 18 polished M-Parallel replicas, Inpro Euros w/ Enchanced Angel eye kit, 20% tint
Clear corners/sidemarkers ---- Eurospec (Depos)
To do list:
UUC System U TDM- 3/05
M50 manifold converstion 3/05
off to the tuning shop for custom software 4/05
Cams/lightened flywheel, throttlebody........ well lets see what happens