850 ('97) Oil types

[Dodski3952]

I've got an 850 ('97) basic model, I was wondering, what type of oil would give my engine the best protection? It currently has 10w 40 and gets used for short motorway and town driving. Would a thinner (5w 30) fully synthetic oil give more protection to my engine? It has done just under 180K miles. Any input would be really appreciated. Dodski.

[merc85]

10W40 SEMI certainly wouldnt go thinner especially on a higher mileage car

[M-R-P]

As above, Mine's on 196k and I use carlube cheap 10/40 semi and change it every 5-6k. Still silky smooth