!!!HEADS UP!!! Those considering a RENNTech tune..
Mercedes is beginning to put a status 8 on your VIN, meaning your warranty may and can be voided upon review.
I dont know how they know the car is tune, but we have had at least 4 cars (not just E63, but S600s and S63's) that turn up a status 8 on the VMI after the tune. So proceed with caution.
Mercedes is beginning to put a status 8 on your VIN, meaning your warranty may and can be voided upon review.
I dont know how they know the car is tune, but we have had at least 4 cars (not just E63, but S600s and S63's) that turn up a status 8 on the VMI after the tune. So proceed with caution.




I just made sure to service them always at the dealer who also performed the tune.
One exception was 2006 SL65 that received Status 8 after serious handling problems caused by frozen Kleemann differential (we had no idea it was the culprit and MBUSA technician was called in, unfortunately a newly hired dealer service advisor blabbed to him about the tune).



