Valve stem seals keep oil from seeping down the valve guides and into the combustion chamber. When they wear out you'll often see blue-gray smoke from the exhaust on startup or when accelerating after coasting, along with higher oil consumption. Replacing the seals restores cleaner running and stops the engine from burning oil.
Find a TechnicianValve seals usually cause blue smoke right at startup or when you accelerate after letting off the gas, while worn rings tend to smoke under load and all the time. A mechanic can confirm with a compression or leak-down test.
On many engines, yes. Using compressed air to hold the valves in place, a mechanic can often replace the seals with the head still on the car, which saves significant labor compared to a full head removal.
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