Engine Oil Spec for Longevity?

[roKWiz]

Originally Posted by Franco Cozzo

Omnicraft fully synthetic 5W30 in all our Euros, but we do services every 10,000km instead of the 15,000km interval.

Caprice takes Nulon 25W60 high zinc mineral cause flat tappet hydraulic camshaft, car gets oil changes when I can be bothered because its done 17,000km in 6 years.

I had fully synthetic 15W50 in it initially and it got super liftery on the dyno once, so I went up to 25W60 and no dramas ever since.

and I though 20W60 was a heavy grade.