Originally posted by mrhonda_187
If it comes out looking just like it went in, it has a very low detergent composition. It is doing nothing to clean out your motor. The oil has two functions: to clean, and lubricate (well, and reduce heat, etc...) If it's ONLY lubricating, it isn't a very good oil.
motor oils main function is to lubricate the engine. if you want a really clean engine, you should use tranny oil. but that doesnt agree too well with engines.
and the inside of the engines that were running the amsoil(which has almost no detergent in it) were extremely clean.
a doesnt need detergents because it should keep everything lubricated properly so you have no metal to metal contact, so no microscopic metal shavings in the oil. and it will reduce temps so that very little carbon is built up which also adds to oil discoloration.