This is hard to believe but I changed that oil soon as I bought it, ran it 400 miles, changed it again and that oil with 400 miles was thick as hot tar and black as coal all over again. For a while I thought I forgot to change it the first time, then remembered I had for sure. So good idea, I’ll run it some more and see if the rings seal and let you know what happens. I don’t drive it much tho do might be a while
Yep, shes a sludge monster. The old oil was black from dirt,crud,carbon etc suspended in the oil. It was to the point that nothing else could chemically bond to it so the rest ends up coating the inside of the engine as sludge. When you add new oil, all that crud starts bonding into the oil again untill it cant absorb anymore and the cycle repeats. It may take several oil changes before it improves.
Make sure your pcv system is working because it will tend to plug up pretty quick and that can spring all kinds of gasket leaks so keep an eye on it.
Its also quite likely that you have an oil filter bypass plugged full of crap. I would pull it out and clean it.
Its also a good idea to cut your oil filters open and see what is trapped in the pleats.
Once you get some semi clean oil running through it, cut the filter open and look for glitter
And, if youre gonna drive it for awhile before you pull the pin on a rebuild, take a look at running DELO diesal oil.
like a 15-40 during the summer it will be fine.
And take a look at every other fluid on that truck. If they didnt changa the oil, they sure as hell didnt change the trans or the diffs or anything else
Please post some pics when you take the valve covers and intake off.
I know some people who dont change their oil and I want to show them that its not a myth