Well, back in October 2016 I took the 80 and the family out camping with friends and I royally screwed up...
That's a connecting rod bearing.
I was almost due for a service and, in fact, thought about sending it for an oil change before leaving but decided I'd wait til we returned. That way the shop could do the oil change and do an interior clean of all the sand from camping. Idiot that I am I didn't even check the oil before leaving. It was just a quick weekend trip and I've never had a problem with the oil level... no leaks and no burning oil. Turns out I was VERY low on oil.
Got myself down in a bowl while playing in the dunes and to get out I had to 4-lo, all lockers, high-revving to get out. Nothing over redline... but a lot of back and forth up the dune faces at extreme angles. Finally got out and when I did I had a knock. And then, again, idiot that I am, I drove it back home to Abu Dhabi. Got a lick of sense at some point and parked the truck, shut it down, sent my family home in a taxi, and had it towed to my shop. They called me and berated me for the low oil.
This motor only had 260,000 kms and I have the full service history. I was heartbroken. Called my dad in shame... he taught me better than this. He encouraged me to have it rebuilt and relayed a story of his youth with a VW motor he'd rebuilt... and subsequently destroyed a bearing and crankshaft. Some lessons cost $.
The shop disassembled the motor and send everything out for measurements. Head were in spec, valves were in spec, cylinders were in spec, all but one connecting rod were in spec, crankshaft was in spec EXCEPT where that bearing sat. And it was too far gone to machine and use different bearings. New parts required: one crankshaft, one connecting rod, engine seal/gasket set, rings. While we were in there we did all new rubber coolant hoses (was on my PM list for this year anyway), new thermostat housing and water pump, new belts, had the head and valves ground, new plugs and wires, and a few other odds/ends.
It's quite amazing how well she runs now.
Drove her at no higher than 80 kph for 3000 kilometers. Now driving her normal. Runs like a top. On a trip to the desert this weekend she performed perfectly. Glad I had the rebuild done. Parts and labor here made it a far more affordable affair than I was afraid of.