I did an initial D&F and a filter change with what is to be believed the factory fill ATF, Pentosin ATF1, on the ZF trans in my Audi. Prior to the D&F, there was a noticeable torque converter shudder on every 2-3 upshift. After the D&F, the shudder was still there. The original fluid was first touched around 75k miles.
The second D&F and filter change I did with Maxlife at 90k miles. The annoying shudder that I thought would just be a normal part of the unit's operation went away in 2 days. I have no idea why the fluid made such a difference, but it did.
Since then, I have run the 50/50 mix of Maxlife and ATF1 for 45k miles and at that point I did another D&F with Wolf's Head Multi Vehicle ATF. The shudder was back within 2 months of the change. I will soon be doing another D&F with Maxlife again (maybe 2 if needed) to again get rid of the shudder.
No concrete evidence that it was the fluid that made the difference, but the circumstantial evidence is sure compelling.
The second D&F and filter change I did with Maxlife at 90k miles. The annoying shudder that I thought would just be a normal part of the unit's operation went away in 2 days. I have no idea why the fluid made such a difference, but it did.
Since then, I have run the 50/50 mix of Maxlife and ATF1 for 45k miles and at that point I did another D&F with Wolf's Head Multi Vehicle ATF. The shudder was back within 2 months of the change. I will soon be doing another D&F with Maxlife again (maybe 2 if needed) to again get rid of the shudder.
No concrete evidence that it was the fluid that made the difference, but the circumstantial evidence is sure compelling.