AC oil and flushing

You do not need to flush the system but just recover the Freon so that you are not sending it into the atmosphere, and you can reuse it, so you don't have to buy any.

Here is a guide that will help with this:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

As for the oil, most compressors come with oil in it so just make sure you check if your replacement has oil or not.

Then see below for the oil chart for the replacement parts. Basically, you add oil in for each component you are replacing.

Please look through this and let me know if you have questions. Keep in mind that you don't need to measure the amount of oil that comes out if you are replacing all components. Measuring the amount of oil that comes out is because some oil gets trapped in other components. But if you are replacing them then just put the oil in the compressor.

Thanks