He said he did that in the original post. Also said he had the head checked.

I just bought an 89 300E, and stupid me, didnt check compression before buying. You would think that someone with 40 years of mechanic background i would know better.

Initially the car ran pretty good, just a miss at idle. No blowby even now. But after driving it home and tinkering on it it has gotten rougher, and a compression test showed almost zero compression. Oil in the cylinder didnt do anything which would indicate rings/piston, and I can blow through the adapter and clearly hear air in the crankcase, so I dont know if its a holed piston or blown rings, but its definitely bottom end related.

This thread helped me decide to give up on it. I gave some thought to trying to fix it, but I dont need any more headaches than I have already, so Im parting it out if anyones interested, I put an ad in parts. With the age and miles its not worth farting around with, not to me anyway. But the head should be good. Car runs down the road fine, doesnt run hot, no leaks or drips.