well...I'm using ester oil since it came with my new compressor. Why is it considered junk? I've read good things about it, and a friend has put it in his system when he replaced it earlier this year...and it has worked great. I didn't have to use any special fittings, but I am going to label the system in case anyone besides me tries to charge it in the future. I know it's probably not as good as r12, but I think it's much better than 134...

Where would I find those crush washers? Is that a normal auto parts item, or am I going to have to try and find some online to order.

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1980 300SD 237k
1983 300D 195k (sold)
2003 Chevy Silverado 190k