Oldblue

I’m surprised nobody mentions Seafoam, or Lucas products

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What do you guys think about using a pressure washer on the cylinder head while I have the valve cover off. Then dumping the oil and residue that resulted from the cleaning by draining the oil at the plug. Replace the filter and refill? I would thing the excess water would drain with the oil and cleaner???
I could then add something like seafoam or mystery oil to the new oil to complete the cleaning. after replacing the valve cover and buttoning up the case. Run it for a while and do a normal oil change next time around.

Radco

IMO I would AVOID the water ! Use Seafoam or Marvel or Lucas !
I would run it for 50/100 miles then do OF and oil change, repeat and then depending on how the oil looks repeat again

Oldblue

No water , it will wash out the connecting rod and main bearings, just like a failed head gasket situation.

PulpFriction

Is that oil/coolant emulsion?

Anything you do, Seafoam or the like, with that much crud, will clog the oil filter an maybe bust it. Better plan on a bunch of oil and filter changes, because anything that gets past the oil filter will clog oil galleys and oil squirters and chain tensioners and VVT solenoids if applicable and i don’t know what else.

sleeper

OP, you never mentioned the miles it has, but I'd guess over 100K+ the hard way, lack of maintenance

I would not disturb it, & Do NOT use Synthetic oil.. That will start cleaning it.

greg8453

If you are interested in an easy long term fix just change the oil with straight non-synthetic and add 4 ounces of dish soap. Change the oil at no more than 1000 miles. Do this for two or three times and it'll get clean.

geg

2 or 3 times - a little expensive, oil is not a cheap product, now is a difficult time

Radco

I never heard of using dish soap in the oil before ! I would think it would cause harm to the motor !

Oldblue

It would wash out the main and rod bearings , major damage