My 2003 Dodge Durango 5.9 oil consumption has me a little concerned it might have a Plenum Gasket issue. Using Pennzoil Platinum 10w-30, topping off with Valvoline Maxlife Syn Blend 10w-30. Oil Changed 5/13/17 – 91,317 miles Currently 1/5/18 – 94,450 miles So, in 3,133 miles I have added about 1.50 qts of make up oil (from my memory). Is this excessive? I have no leaks, no smoke at startup, no rough idling or on acceleration. Any advice or help would be appreciated. Truck runs great.