So I've been debating switching tranny fluid from the VW mineral stuff to redline D4. I figure if the torque converter is being taken off then I should be able to drain 90% of the OEM fluid. The only concern is that it is going to cost me $200 for a case of the redline stuff. I also have a line on pentosyn fluid for about $150 a case. I know from searching the forums that some of you have had good experiences with the D4 fluid but what about pentosyn? Any info on experiences with these two brands or others would be welcome.