Hi have a 280SL in that I am valeting for a customer. It is an automatic transmission and seems to be holding gears for too long and then when it just change it is rather aggressive. Any ideas what the issue may be. I am in Spain and just trying to help a fellow brit out as the mechanics here are not all that. Didn't know if it is a regular issue with low/old oil etc or something more sinister. Any pointers greatly appreciated.