Snake oil, every one of the ones you cited. Stay away from the additives. Most contain PTFE (teflon), and they will clog up the engine. Stick with a good grade of 5W-20 or 5W-30 synthetic and change the oil and filter every 3K-5K as recommended.
Oil additives
Anybody believe in oil additives? Duralube ?, Prolong ?, Slick 50?. Good or bad for the engine ?
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