Oil burning causes blue smoke. You may just be burning off condensed water from the exhaust system. Steady white smoke implies coolant getting into the cylinders from warped heads, (overheating caused) leaking gaskets, (either intake manifold or heads) or cracks in cylinders/heads. Are you having any problems with your cooling system--loss of water over time, running higher engine temperatures than before? High mileage oil is useful when the engine starts emitting light blue smoke at times and oil is lightly consumed by the engine. The oil contains additives that soften seals around moving parts and frees stuck piston rings. Radiator sealer can sometimes stop water leakage into places other than the combustion chambers but is considered to be a cheap stop-gap measure. Hope this helps!
Usually:
white smoke is coolant leaking into the combustion chamber
blue-ish smoke is oil in the combustion chamber
black smoke is excessive fuel (running rich)
If it is white smoke, pull the oil dipstick and check to make sure your not getting coolant in your oil.
If thats okay check the compression on each cylinder to make sure your head gasket isn't leaking.
if your car is burning oil, you may need to replace your PCV valve(about $5).
As far as oil additives, try RESTORE
If it only happens at start, it is usually not rings but instead worn valve guides. You can have new guides installed or knurl the existing guides, but unless it's fouling the plugs, it isn't worth the cost. Do it instead when it's time to rebuild the whole engine. my opinion...
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