Why would r134a over r12 need repairs earlier? If that is the case I would rather do r12...

I've removed my wheel before, so I am familiar with the process so I will remove it for ease.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k