Hopefully I will not write too much here having had classes in the non-mobile types of A/C and have worked on various mobile systems for years. There is a stigma attached to retrofits and the oil compatibility of each. 5% mineral oil is the max recommended for a small hermetically sealed system, the rest should be an ester based oil. Having said that mobile units use PAG oil which is different. Using a recovery unit usually removes most of the oil from the system during the recovery cycle. When recharging add some PAG especially if changing the compressor.Of course if fixing a 134A system and have the refrigerant it can go back in if recovery was done correctly. Most repair stores require changing the accumulator/drier and the metering device if a standard orifice. Oil return on mobile systems does not seem to be a problem as the velocity of the refrigerant is enough to get it back to the compressor and the compressor is different than the sealed motor/ pump units that have electrical windings in them. Flushing really applies to burnt wires in the electrical motor which you do not have , so flushing isn't going to help a lot. So fix the leaks, changing the o-rings as mentioned before, vacuum for a long time if possible(500 microns if you have a gauge but mobile systems are hard to seal for that quality of vacuum) and recharge to 80% by weight or by the correct volume if using a sight glass. It should be fine, I have done quite a few over the years and they last quite a while but due to the shaking and such will eventually leak. Occasionally I run across a system that does not leak which is great. All the rest of the posts are good info also if I missed something.
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