Effect of fuel and lubricant composition on engine deposit formation.
"The oxidatively stable synthetic oils minimized varnish but esters accumulated much more pentane-insolubles than polyalphaolefins or alkylbenzenes."
Pentane-insolubles in motor oils can ultimately contribute to increased wear connecting rod bearing wear, as documented in the SAE Technical Paper Series #810330. Engine Oil and Bearing Wear. Esters above refer to Group V synthetics, where polyalphaelefins (PAO), as group IV synthetics.
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