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The rings are gone. Or a cracked head. Do a compression test. Pressure should be around 140 lbs. Test all 4 on that side. If there is more then 10 lbs. diff. between all 4 you need motor work. To see if it's your rings or valves are bad. Get a squirt can with oil in it. After initial reading squirt about 6 squirts in plug hole , test again. If pres. goes up it's your rings. If it don't then it's your valves or head problems. Poss. valve guide covers also.

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Q: Why is there oil on your 1 spark plug on 350 Chevy?
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