What oil is suitable for an au xr8 5l engine , thanks

The recomended viscosity is anything in the range of 10W-30 to 20W-40. Brand and composition comes down to individual choice, although synthetics are generally more prone to leakage between gasket surfaces

Ford lists 10w30 for all except the AUII XR8 which it lists 15w40.

Thanks, wasn't after a brand Just the recomended viscosity,

What mineral oil do people on here recommend? I know im opening a can of worms here but just looking for a general consensus. I have heard some people on here highly recommend penrite, but others say they would rather pi$$ is thier sumps than use Penrite.

I'm currently using Semi-Synth Penrite but it does make some noise on startup. Open to other options.

KMX(Kmart) 20W50 works well in the EB XR8 and only $19 for six litres. Drained it this afternoon and came out like honey and a new Z9 filter. The AU I think you could stick to the 15W40 no problems. EDIT***the KMX is a SG/CD and is good for all E series according to the users manuals. It is also compatible with LPG systems. Even during the minus 6 degsdown here there is no tappet noise at all and warms up quickly with consistent 60 percent pressure***

Don't be sucked in with all the hype on the $50++ mineral oils as the cheaper ones will out-perform them in most cases.

Good Luck