I agree with Peter and leathermang. If you have debris in the system, you'll have to do more than just replace the compressor and top off the lubricant. There are a number of things you either must or may have to do.

Break the system down to its individual components and flush the debris and lubricant out of each component (except for the compressor and drier).

Install a filter just before the suction side of the compressor.

Sometimes the condenser simply cannot be properly flushed and may have to be replaced.

The drier must be replaced.

Any short cuts would probably result in a short-lived repair.

I thought the best lubricant for systems converted to HFC 134 is the Texaco HFC 100 synthetic lubricant. The name has changed recently, but the guys at aircondition.com and ackits.com should know what you're talking about when ordering it. I use it for all my a/c work.

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95 E320 Cabriolet, 169K