Mine doesn't leak, but it's most likely because it was neglected by the PO and I can see plenty of crud in there, although it is better than it was after several years of diligence on my part.
I'm not a big fan of 5w30 in the 4.0 (even though they seem to run great on it,) so I only run it in the real cold months here, which will be December to March then OUT it goes!
You listed several of the best choices IMO but for me I've settled on Pennzoil. It runs quieter than anything which I like, it is high in detergents which I need, and it produces excellent UOA's.
I'm not a big fan of 5w30 in the 4.0 (even though they seem to run great on it,) so I only run it in the real cold months here, which will be December to March then OUT it goes!
You listed several of the best choices IMO but for me I've settled on Pennzoil. It runs quieter than anything which I like, it is high in detergents which I need, and it produces excellent UOA's.