It it worth using a motor oil conditioner? Do they actually help keep an engine running better, or are they just marketing ploys?
Just use the manufacturers reccomended oil, oil additives for the most part are gimmicks. If you really want to protect your engine use a quality synthetic like Mobil 1 or the like. Modern engines have more consistent tolerances and can even run oil for longer periods of time. Stick to manufacturer recommendations, whats in your manual. No amount of additive is going to improve how your engine runs, unless its hiding a larger underlying problem.