Cam synchronizer should be inspected for wear. I don't necessarily agree that it requires regular replacement, the trick is to keep the bushing lubricated because a bad bushing is what eventually causes play and then gear failure. Every oil change, you can pop the cap on the synchronizer and add a drop of oil down the shaft. I actually drilled a hole in the synchronizer cap and put a plug on it to make it easier to lube the synchronizer regularly.
Next up is the timing cover gasket which go bad with time. I had to do that recently after discovering the coolant level was going down.
Lastly, apparently it's common for these engines to consume a bit of oil when they age. Bit annoying, but just check regularly.