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Nearly all lubricants contain engine oil-additives whether the oils are synthetic or petroleum based.

Engine oil-additives are chemical compounds that improve the lubricant performance of base oil.

Most of these engine oil-additives will already be in the oil as it comes from the manufacturer. Yet if you walk into an auto supply store, you’ll find bottles of aftermarket engine oil additives. Many claim to improve performance even further and make your engine cleaner than the detergents already in your oil. Are these additives worth buying? Will they do a better job than the additives already in your oil? Or are they just redundant and possibly even harmful?