I don't think it really will make all that much difference in engine life, unless of course You are driving it 500 hundred miles a week or something Even then it probably would not matter that much if each was serviced occasionally. 
"All right, they're on our left, they're on our right, they're in front of
us, they're behind us...they can't get away this time"
Lt Gen. Lewis B."Chesty" Puller, USMC
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