If the motor doesn't burn oil then the valve guide seals are probably OK.
After a mile or two of driving the motor should be at about 80 degrees
C., if not, the the engine's thermostat should be replaced with a new one.
I asumme your talking about a gasoline engine. With bad valve guide seals
you'll see blue smoke on start up and it'll run pretty good. Oil consumption
can be significant like a quart every tankful of gas. Plugs can get fouled
ans so can the O2 sensor. Some seals can be replaced from the top without
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