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The best at keeping moisture out of your Prius a/c DENSO ND-11 oil and one for hybrid tracer dye, because of the glass inner tube is absolutely the best at keeping down moisture. For any hybrid repair shop who repairs a/c or still getting used to the ABCs of a/c repair its a safe bet to keep your DN-11 oil in one and your trace dye in another one. The best and only place for a automotive shop to get information and training is www.macsw.org all the others are ok but remember most or the quickie 4 or 8 hour a/c training class are put on by after market compressor and parts sellers, chemical sales of oils, dyes, and sealants. They need to make what ever they have sound simple and easy and is the best think since apple pie. Take it with a grain of salt. Some products work when first installed but cause a failed system or reduced performance later. As a shop owner go to as many a/c clinics an take your TECHs with you, after you go to three of four you should learn to see a pattern and separate the sales BS from the good stuff. Then fly to a few or the MACSW trade & training shows it will jump your shop years ahead of the others and will be the best thing for your customers to.