Maybe someone could take a high-revving engine to the Test Course (i.e. Spoon Civic Type-R, or an F1 car for that matter) and drive it around until the oil light comes on and note at what mileage count it took for the light to come on, then go run the same test with a low revving-engine. (i.e. Dodge Viper GTS) At the Test Course you can pretty much keep the same driving line so that shouldn't be an issue. This would be very time consuming, but if someone is interested enough or that much of a hardcore gamer then it can be done.