Just my two cents.
I put amsoil 5w50 in my 350 and it gets along well. - i buy mine directly from their website.
This definitely influenced my decision on oil choice
Hey, what's up man,
i have a leaking rear main on my 18' gt350 and i installed the mmr rear main seal and plate. did yours leak again after you put rtv on those highlighted parts on the block?
Thanks!