Bruce,
Your funky o-rings may be a sign of water/oil in the aux air system that got mixed up with dust and dirt. Make sure you frequently drain the air tanks, service the dryer filter and drain any water out of the small black cannister in the steering bay (assuming you have one). Also, if you have a aux compressor with it's own tank, make sure you drain that one often, I get a little moisture out of mine everytime I drain it and I do it often.