Those Cologne V6s certainly took some fettling... 
Oil changes every 6k, tappets and plugs every 12k, plus another 3k of trying to stop the rocker cover gaskets from leaking 
And that's without worrying about rust and coolant loss...
Remind me, what is the oil change interval recommended here for an Omega V6?
Dry rocker covers are simple; get a pair of alloy covers and the late rubber gaskets from Ford. Job done. Although they were rare, and are now outrageously expensive - the last ones I sold 10 years ago went for £100 a pair. Failing that, you just straighten the flange(just like any other pressed steel cover from the last 80 years), use the spreader plates from a Pinto cam-cover and forget about it.
Coolant loss on a Cologne is down to the thermostat or water pump, both of which suffer from very long, M6 bolts which are incredibly easy to snap off. It's really rare to find a replacement waterpump that doesn't have at least one broken bolt.