From a lubrication and component cooling standpoint, there's no reason you can't switch from dino to synth and back, or even mix a quart of dino into a sump of synth if you find the level low on the stick. Dino-oil isn't as good an oil as synth, but the two are not incompatible.SolarSlash said:ive heard stories that "once you go synthetic, you can never go back" to regular oil? is this true? what conseqences are there from switching? thx.