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Yes! You may here many people say that it doesn't hurt to mix these oils. However, they are not compatible and this will damage your A/C system over time. Many people that I know have mixed these oils and over time the A/C's compressor went out. Furthermore, the system needs to be retrofitted. These retrofit kits can be purchase at many automotive parts stores.

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Q: Do you need to remove the old compressor oil when converting to 134A from R12 Freon and refill with new oil compatible with134A?
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