I know I have to manually check the oil, but I do like the feature that it will tell you the oil level in the car. Unfortunately, can not figure out how to get that function to work on the car I just bought. I have read the manual, but I must be missing something, because I don't see what the manual is telling me I should see. Is there any (Crossfire for dummies) one that might be able to give me some help with this?