My sister just picked up a 2003 Civic with the 1.7L. She lives in Iowa too so I do most of her oil changes for her. According to Carfax oil was changed at a Honda dealer every 4-6K, so I'm guessing a conventional 5w20 was used. What should I throw in it? It has 169K on her so I thought about using a 5w30, but I dont know anything about Honda maintenance. TIA guys!