Wow really hard to find info on internet about these cars. I am looking for Refrigerant amount for a complete recharge on a 451. Someone posted 458G or 1.4 lbs. for the 450 but I found different #'s on another site?? I also found the capacity for a/c oil, which is listed as PAG/ PAO68, as being 420 g or 14.815 oz.'s. This info was from BEHR Hella service chart. They also listed the 451 refrigerant capacity as 0 = unknown. They did have the refrigerant capacities for the 450 as being 180 ml's & the 454 roadster as 100 ml's. Far different from the first #'s I found? Anyone have an answer for the 451 refrigerant amount?