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Not including the trans but I have mixed and swaped out synthetic with regular many times with know adverse effects but have notice better running off synthetic and fuel miles.The only reason is because synthetics are so popular that sometimes I can't find it"sold out"and if other places have it there. They want to much for it. I like to shop around but if i can't get it at the right price I will mix a little whats lift over with the same brand mobil regular with mobil synthetic. Keep in mind other brands use other additives so i like to stick with the same brand at least.Just part learned and part preference. Gary.
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