Picking up a used 2017 Titan for a very very good price. I had the cylinders scoped, and cylinder 7 had the notorious vertical scratches in it from the factory.
The engine itself has 130,000 mi, runs perfectly, and has excellent maintenance records all the way back so original in-service date.
It is also very likely going to start knocking sooner rather than later. The truck will not see any heavy towing, it will mainly be used as a daily Highway commuter and spend most of its life at 2300 RPM.
I already have the money set aside for the replacement engine and installation since I never have time to do anything fun anymore, but I'm curious which oil would be the choice given the situation.
Nissan originally spec'd a 5W30 for this bottom end, and it has slowly gotten thinner with time to 0w-20
In my vq40 setup, I have always run 0w 40 or 5w40 at 10,000 miles intervals. With 307,000 Mi on the clock, it pulls just as hard to redline as it always has. And it's run to Red Line countless times a day.