I'd get a UOA done, especially if you don't have an OLM. My Liberty has an OLM which I never paid much attention to until I zeroed it out a few times when I changed my oil. Having followed some of the blanket statements I often hear, like this dino oil should be good for 7.5K, and that synthetic for 10K and another oil should easily do 15K, etc. My OLM tripped at 5,430 miles, my wife's commute is 43 miles round trip. Granted this is NY and the conditions suck. The moral of this story is don't follow someone else's UOA, or blanket statements about how long an oil lasted for someone else. Do your own homework.