[57taskforce]

That’s no good. Marvel mystery oil mixed in with fresh oil will do wonders at cutting sludge. That is pretty heavy looking though. I’ve mixed 3-4 quarts of 15/40 into the rest of the full capacity of marvel in the past and had pretty good results. Don’t run it around much mostly just idle time with maybe a few highway miles really, really, Babying it. I had 3 quarts 15/40 to 2 quarts marvel when I first fired my IROC up. The thicker oil helps to offset the thin marvel. Mine turned black within about 3 hours of idle running and moving it around the house. There were no highway miles on it at all when I changed the marvel concoction out for normal 10/30 and a new filter. I wouldn’t be surprised if you’ve got some sticky lifters at a minimum with it looking like that.