Re: My car burns oil really bad
Personally, I had a 91 Town Car with the same issue and indeed it is valve seals. I switched from 5W30 conventional to 10W30 synthetic Mobil 1 and my oil consumption went down HUGE. Almost half of what it was. I attribute that more so to the change in weight rather than going from conventional to synthetic.
In my opinion, if you are seeing increased oil consumption, I would go with a heavier weight oil but still run 5W30 in the winter. Going to a heavier weight like 10W30 will fill those gaps in the engine that have grown larger from age. You WILL notice less consumption. I did.
-1992 Ford F-150 (winter truck)
-1998 Lincoln Mark VIII LSC (fun car)