Crankcase cleaning - just started up a junkyard engine

[erikv11]

Compression test results, trusty Harbor Freight junk gauge:

192-194-192-172-202
200-210-190-180-205

So #4 is down a little, I am going to be optimistic and consider the rings are just extra sticky/dirty in that on. I'll check again in 500 miles or so, see where the readings are.

I like the advice of just running dino oil for now, so no additives have gone into the case yet.

[dbm123]

Proceed at your own risk, many people love this treatment but there are a very few reports of it supposedly ruining the engine. If you are going to do it, read some of the many many posts about it, don't just go on my recollection.

I watched the how to video on SeaFoam's website. It looks like that for general cleaning use its safer to just add it to the oil and add some to the gas tank. My question from before was really about getting a suggestion for which vacuum hose would be best to use on a Volvo for that application.

[erikv11]

Seafoam into the crankcase (oil) is common too, that is what I was asking opinions on in my original post, but in the crankcase it will not touch the intake ports or the valves. For the intake treatment, just use any vacuum hose (or a new one you put on just for the treatment) from the tree.

[brandonbeach14]

Seafoam also makes a spray now that you can put into the vacuum tree with less risk of vapor lock.

[SimLyons]

I used all 3 methods. In the crankcase (changed oil after about 40 miles), in the gas and in the intake (via the tree, using a hose from my cllection and about half a can of Sea-foam). My car runs really good, no more black junk out the exhaust all over the garage floor and smoother running. Of course, I did all this just prior to changing out the PCV. It was all part of some major servicing I did. BTW: The car was using about 1 qt of oil/800 miles before. Now it has used none measurable in 1100 miles.