Originally Posted By: lsxjon
I just drained my Amsoil HDD 5W-30 from my 2008 2500HD with the 6.0 gas engine and filled it with Lucas 10W-30 Synthetic.
I think you'll be fine.
I used the Lucas 5/30 Synthetic in my '04 GTO for an interval determined by my OLM without any issue.
After the Lucas, I put in another often overhyped and expensive boutique oil, and was rewarded with the beginnings of piston slap.
I wouldn't hesitate to use the Lucas again, but it's not sold locally here, AFAIK.
Maybe Lucas needs to develop a well respected distribution channel, like, um, multi level marketing.