I think it is good that you want to do your own work. I would just write down everything you do and keep receipts of major parts. Document where, when, and at what mileage you did the service for sure. That may not be as good as the dealer stamp to some but I don't think doing your own work will depreciate the car any. Quality work is not something only a dealer can do and if your car is well cared for it shows.
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