Valve guides--usually intake guides--leak oil into the combustion chamber, where it's burned, and then exits via the exhaust. Intake guide leaks usually are more noticeable under high vacuum conditions. Exhaust valve guides leaking oil are seldom major smoking problem, but they may coat the exhaust manifold with oil if they're severe enough.
When you have oil smoke in the breather, think about how it got there in the crankcase...it could ONLY be the rings, providing nothing's cracked.
Get a leakdown tester, and perform a leakdown test. While oil smoke on startup ONLY [or on deceleration/high vacuum conditions] is usually a sign of valve guides, constant smoking out the breather can ONLY be caused by bad rings. You may unstick 'em with ATF, or you may have to bite the bullet and tear it down.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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