Hi my name is justin. I have a 94 honda accord 2.2 liter v-tec I recently change my oil and upgraded 10w30 motor oil to 15w40 motor oil will 15w40 oil affect anything in the long run to the engine. ii get 135 miles on the car every day because I commute a long distance to work. I open it up meaning going 125 every other day. Can you tell me every thing you know about upgrading oil to my car and if it will really damage anything if so what can it damage.and if 15w40 is good for my car, or what you can recommend to me. THANKS