Abstract
This paper investigates the effects of sulfonate additives on the tendency of oils to form varnish under high-temperature conditions in engines. Neutral and overbased sulfonate additives prepared from synthetic alkylaromatic compounds were used in the studies presented. Also investigate is the influence of the additive concentration in the oil on the additive effectiveness. Synthetic sulfonate additives are shown to give a significant reduction of the tendency of oils to form varnish at high temperatures and the additives can be used in formulating motor oils for use under severe service conditions.
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