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What is the best AC oil to use in R12 to R134 Conversion?

After frying 2 compressors,when one of my hoses went bad with a leak I didnt detect, i am starting to wonder why the compressors went, other than the fact that they were Pep Boys rebuilds.

Even if the freon escaped, the compressors shouldnt have toasted..Even "dead" compressors on Old cars dont fail....

One compressor starting making so many terrible noises and when I investigated, i found the innards catatrosphically failed as if someone had stuck sand or steel shavings in the system...
What is the best AC oil to use in R12 to R134 Conversion?