It passed its MOT a few months ago I think? Then presumably it can't be burning an excessive amount of oil or the emissions test would surely have picked up on something?
If its not dripping it and no breathers are blocked, then I don't see what you can do economically. If it was burning that much in a bad way it'd be rings, valves or similar - and it'll be cheaper to pay for the oil.
I think its just a higher consumption engine.
I would have thought a thicker oil would be a bad idea. But then I don't really know how much thicker it actually is.
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