This morning I went around to a few shops until I found 14mm and 17mm hex wrenches, a fluid transfer pump and 2 litres of Royal Purple Synchromax.
I loosened off the fill plug first to make sure I'd be able to fill it back up and then I dropped the drain plug. Looks like it's been a while since the oil has been changed. This picture shows the amount that spilled out of the fill hole.
I haven't seen many examples but I would say this amount of shavings means the oil change is a bit late.
I filled it back up, started it up and let it get to operating temperature. So far so good. No noise. ...But... I didn't get to go for a real test drive because while I was underneath I noticed that one of the skid plate bolts had let go.
It's tough to tell from the picture but it looks like the last owner used a nut between the skid and the frame on the middle and forward bolts but the rear bolts have nothing between the skid and frame.
I tried relieving some of the pressure on the skid plate with a floor jack and screwing it back in but without the pressure the bolt just fell out. You can see some crappy welds between the washer and nut. I'm not sure what he was trying to do here.
Should there be a nut welded to the inside of the frame that the skid plate bolt threads into?