dirt in your oil ? are you not using a filter LOL sorry had to .. yes oil get contaminated but its the additive that break down is the real reason for changing your oil .. i wont argue with people that change there oils more frequently but if your car is in tip top running condition your oil should be good for 5-6000 miles depending on driving conditions as your service manual states . oil and cars have come a long way . i run synthetic and let it go about 8000 miles before my change
Quote Originally Posted by Zef_66 View Post
Having the engine warm will mix all the dirt and stuff through the oil and have it suspended in the oil. Then when you drain it, the contaminants will come out with the oil. If you drain the oil from a cold engine, the contaminants will have settled to the bottom of the oil pan and all the dirt and stuff may not drain out.