The 450 didn't have hardened valve seats, none of the V8's of that period did. I have a letter from MB stating the fact and recommending having them fitted or using alternate fuel fills and using a moderate driving style.
The 450 didn't have hardened valve seats, none of the V8's of that period did. I have a letter from MB stating the fact and recommending having them fitted or using alternate fuel fills and using a moderate driving style.
There has been a lot of discussion over this on other Forums, but they definitely don't have hardened valve seats. Opinion seems to be split 50/50 as to whether it's worth having them converted. Mine didn't like unleaded so I used to used additives, leaded and LRP. Each to their own really.