[undertow]

I've had 2 AU XR8s and they both use about 0.5L between services. 15w-40 or 10w-40 doesnt make much difference, I use the 10w-40 as it's a bit less thick on cold Canberra mornings. Magnatech and Shell HX-7 10w-40 can often be had really cheap on sale and are both good oils (ACEA A3-B4 rated which is a pretty tough spec)