Good question Larry. When I bought the car at 130km, it had been serviced only by the dealer, and since then I have done 5000km changes with Mobil 1, each one myself. So I'm clueless.
Now, the only reason I'm bothering to ask anyone about the cam, in particular, is because Donnie replied to my post a couple of weeks back, regarding the 'ticking' sound I was getting. The consensus from the respondents was that it was likely lifters, but Donnie did mention the camshaft, and that he'd done them on this model, this year ('86). I dunno. My tech says lifters as well, he's had the advantage of hearing it, though!