sdelasal

You don't give details as to whether your system is in need of repair or if you just want to change over just to change. I would stick with R-12 if you can still get it in the UK if you just need to replenish a little. However, if you need to do more work on it you may want to consider the following.

My 240D was converted to R-134 when the compressor went out; however, I wasn't satisifed with the cooling results. I live in Houston and the summers here are brutal with high humidity. I wanted to reconvert to R-12 but didn't want to pay the cost of this scarce commodity. I did some reasearch and found an alternative refrigerant called Duracool. www.duracool.com

It is compatible with all oils, is non corrosive and is non-ozone depleting. The only potential risk is that this type of refrigerant is flammable. But with only about 16 ounces of this stuff, it isn't worth worrying about.

The results from R-134 to Duracool is like night and day. I had a thermometer placed on the vent to see the difference before duracool and after duracool. The temperature dropped about 10 degrees cooler with duracool as opposed to r-134. It was well worth it for me. But as somebody else has said, the 123 body style a/c is marginal. But I am able to stay cool in the summer time as opposed to the r-134 system.

From my understanding, the UK doesn't get particularly warm. Since you live in UK, r-12 or r-134 may be ok for you. You need to make the determination how cool you want to be and whether you can even get r-12 anymore in your country.

Herb
'82 240D
'87 300SDL
'92 300D 2.5 Turbo