Paging DirtyLarry, roommate bought an 8.1 Yukon XL

[DirtyLarry]

Not only cheap fuel but looks like some cheap spark plugs too. I prefer to run only Platinum tip plugs in the later engines. As odd as it sounds because they have white deposits on them, they all look to have some oil fouling although 2 and 7 do look like fuel build up on them like leaky injectors. 8.1s love oil, especially the earlier ones.