burning oil

Q: The culprit is a 1989 GMC 1500 4×4 with a 350, automatic with overdrive, a 3.42 axle, and over 150,000 miles. It has recently developed a powerful thirst for Texas tea, consuming 1 quart every 100 miles. A new PCV valve didn’t fix it, and a valve job only eliminated the smoke at startup.

Your dad probably taught you the importance of checking a vehicle’s oil level shortly after you got your first Big Wheel. And right around potty training, he probably also trained you to “change your oil every 3,000 miles.” It’s probably one of the first things you learned about car maintenance! But what if the oil system starts to have