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20W-50 would be way too thick for your truck. The recommended oil weight is 5W-30. I use 10W-30 on my 184k-mile engine. The timing chain noise is due, usually, to a worn guide or worn chain. I think it also may have something to do with the tensioner needing "pumping up", but I'm not sure on that. Mine starts cold quietly. But if I start it after a short hot soak (10 minutes to even a few hours), it'll clatter like a diesel. No big deal I guess -- it's been doing this for who knows how long. I pulled my cam cover last year and everything near the chain actually looks very good. I think Nissan valve trains are just plain noisey. My brother-in-law's previous car, a '96 200SX with the GA16DE engine, rattled all the time at startup.
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