but jeff bartlet says sticking to a regular schedule is critical to longevity of the car. >> when a small problem does arrive tackle it because big problems are often inconvenient. >> consumer reports also says don't skimp on parts. buying wrong oil or lux can be a costly mistake. knowing when to pull the plug can be difficult. >> when this car becomes unsafe or still isn't reliable. and if the repair is adding up to more than the car is worth, then, it's time to do some shopping uk go to the list foremost reliable cars. here is the controversy. they make it seem simple. if you open up your owners manual it's going to tell you change oil every 10,000 or 15,000 miles, if you talk to a mechanic they're going to say every 3,000 miles. that is what you do. >> more you change, you've got a better chance ofing no knot having the car go wrong. and on the other hand the car manufacture, i mean, i tend to follow their instruck autos depending on the mechanic, they'll tell to you bring it in never every day! >> and they say once out of warranty the manufacture doesn't care if it's still operating.