vague question, what typr of engine, all engines take different oils
Rotella T is the best oil, in my opinion, for diesel engines.
20 50 heavy oil is good for height milage engines
A good rule of thumb is to use 5W-30 for newer engines and 10W-30 for older engines or engines that are driven in hot climates or for primarily highway driving. If the manual to your car is available, use the oil that is suggested.
alot of us seem to agree that Royal Purple oil does very well in Rotary engines
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Smoking engines tend to be signs of burning oil. The best solution would be to get your mechanic to see why your oil is being burnt.
Castrol 20/50, best oil for small hi rev engines.
It all depends on the model year, engine size and part of the country that you live. As an example the new 5.7L engines use 0. viscosity oil while the others size engines use a much heaver weight.
oil
It is better for engines, more pure and burns cleaner. It's better for care engines.
Oil rated for use in 4 stroke motorcycles is best. 20w50 is the most recommended "weight". Regular automotive oil is not recommenced due to the temperatures air cooled engines run.