My experience has been as such, 88 Toyota truck and 89 Accord that I converted myself as "drop in" conversions. Both work very well and have lasted several years since conversion. Cars I bought new (the family car driven by the wife) have been, 93 Camry, 95 Avalon, 98 Millenia(POS) and 99 Regal. All r134 cars and all except the Millenia had great AC systems. In 95 I bought a 93 Nissan King Cab (later gave to my son) and the AC has never been touched and still works great! The 89 W124 's compressor was nearly toast when I bought it, so I had it professionally converted with a new compressor. All I can say about this car is that I'd rather drive it in cool weather as the heater works a lot better than the AC. I'm seriously considering converting it back to R12, but from what I have read here, It probably won't help much, since this was a poorly designed system to begin with.