Best Oil? 2006 6.0L ZR6

[G7jockey]

The Pleasurecraft manual suggests 15W40 for prevailing temperatures over 50 Fahrenheit and 5W30 for prevailing temperatures below that. What are most folks using? What brands do you like best? Thanks!

[Stevemo14]

I run AMSOIL in everything I have ever owned. Cars, Trucks, Diesels, Yard Equipment, ECT. I have never had an oil issue in the 20 years I have been using it. It's not that expensive if you sign up for the preferred customer program.

[Nautiquehunter]

Mobil 1 15w50

[bturner]

Unless I missed them I think this is the first oil thread on here this season. Pretty late this year.......

Rotella 15-40 full synthetic this year and last.