What I am finding is there's fewer and fewer experienced mechanics left to keep these old piston engine planes in the air. All the kids that graduate from the local tech program where I live want to work on turbines, especially turbine helicopters, because that's where the money is. Can't blame 'em, they got bills to pay and new mortgages too.
No problem finding mechanics that know C-172s and Cherokees, but most of the owners of the more complex older airplanes like Comanches, Mooneys and the Aztec I own, need to become familiar with the maintenance protocols and involved with the maintenance, or stuff just gets overlooked, ignored, or done wrong. I am fortunate there's still a few guys around my airport that know their way around an Aztec, but we lost one to old age earlier this year and the others are really getting on in years.
I thought about selling the Aztec and trading up to a Piper Malibu, but I can't fit in the damn thing. And a Cirrus, any Cirrus, is just not my cup of tea...