Our maintenance shop, which we have been using for the first time, was supposed to do the annual inspection on our Mooney. They found that the crankcase of our angle valve Lycoming IO360 has two big cracks and that the prop needs to be re-sealed. It turned out that they insist on handling the repair / overhaul of the prop as well as the engine and that they will be adding a profit margin of around 10 - 20% on the invoices of both, the prop and the engine repair shops. I addition, they will still charge us for their labor and the materials they'll be using. Is this a common practice or a rip-off? Local friends believe they are trying to take advantage of us and so do I. What do you think? Oliver Edit, for clarification: Removal, crating and installation of the engine and prop are NOT included in the markup. We still have to pay for all of this separately. Zephyr quoted $27,900, while our shop wants $33,000 (they are using a different engine shop) for an overhaul with the same contents. The only thing that is out of the ordinary is, that we will need a new crankcase, what is also included in the Zephyr quote. Removal, crating and re-installation of the prop and engine will cost us at least another $3,000, based on what I was told (also for this, no written quote).