My GMC Suburban is consuming too much oil. What's the problem with it?

Most vehicles, especially the new engines of today, normally consume approximately half a quart of engine oil every 3,000 to 5,000 miles. As the vehicle ages, it's normal that the oil consumption goes up. However, if it is using up too much engine oil, this should cause concern. One common sign that the engine is using up too much is oil is if the exhaust is emitting blue smoke. A lot of vehicle problems can arise from too much burning of oil like damaging the spark plugs, oxygen sensors, and the catalytic converter. Not only that, it can also damage the whole engine.

The most common causes of high engine oil consumption are worn or faulty valve guides and piston rings. If the clearance between the valve guides and stems is too far or if the valve guide seals are already worn out, damaged, or not properly installed, engine oil will be sucked down to the guides and into the cylinders. Compression in the engine is still possible, but you're going to have to refill the engine oil often. It's a different story if the problem is caused by faulty or worn piston rings as the engine will have low compression.

This problem can only be fixed if the worn-out or damaged parts are replaced with new ones. If you are not knowledgeable in replacing the broken parts, it is best to seek the help of a professional mechanic.

There's a knocking noise coming from my engine when I start my GMC Suburban. Am I in trouble? What's causing it?

It's a big YES. If you hear a knocking noise coming from your vehicle's engine, you should be worried. Your engine is made up of various moving parts and if one or more fail, you can start to hear a knocking sound coming from inside it. The probable points of failure can come from faulty big end bearings, damaged engine oil pump, low engine oil pressure, broken valves hitting the pistons, and so on. When you hear the knocking noise, you should pull over immediately and check the engine oil, or it will be wise not to use the vehicle and have it towed and brought to a service center. If you continue to drive while hearing the knocking sound, your engine can get damaged and the damage may be irreparable.

I'm having trouble starting my vehicle. What's causing it?

If you are having trouble starting your vehicle, you should first check your battery if it is still working properly. Make sure that it is still charged. If not, you should have it charged. If it is already more than five years old, you should have it replaced as it might be already dead. However, if the battery is still okay, you should start checking the ignition system and its components. The problem can be coming from faulty spark plugs and wirings. Make sure that the spark plugs and wirings are working properly.

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