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An illuminated oil warning light on your car's dashboard can stop you in your tracks, but before you start panicking, it's essential to understand what that nagging light could really be telling you – and it isn’t always a leak.
The oil light can be a cry for help from an abnormal oil pressure situation, a clogged filter, a failing pump, or even a faulty sensor.
Leaks are the messiest situation, and they can range from slow to fast (fast when the oil is coming out under pressure).
Some oil problems also don't have an illuminated dash light – you might notice rough running or a puddle of oil under your car instead.
If your oil level is too low, a simple top-up using the manufacturer-recommended oil may be all it takes to silence that judgemental glow, and if there's a mechanical issue or sensor behind it, a reputable mechanic can help.
But here's the real question - what caused your car to start guzzling oil?
Separating "normal" from excessive
Even the newest cars on the road aren't immune to excessive oil consumption.
Automakers have wildly different definitions of what constitutes "normal" levels, with some considering a quart burned every 1,500 miles just fine, while others set the bar at a much more conservative 5,000 miles per quart.
Generally speaking, if you have to refill more frequently than the manufacturer's guideline, you've entered excessive oil consumption territory. And unlike your college days, excessive consumption is something you really want to avoid when it comes to your car's oil.
Old engines are more likely to burn through excessive oil, especially if they have inconsistent service history and high mileage. These engines have well-worn parts, so they are more likely to have small leaks.
The usual suspects
Leaks
The simplest cause of oil consumption is old-fashioned leakage. Whether an external crankcase leaves puddles in your driveway or internal leaks allow oil into the combustion chambers, any loss of oil will require replenishing that slippery substance.
Burned at the rings
Worn valve stems, guides, seals, and piston rings can all allow oil to seep into fiery combustion chambers, turning it into burnt oil. Blue smoke from the exhaust is the most obvious sign of burning oil.
The wrong oil
Using the incorrect oil type or quality can also trigger increased consumption woes. Engines are designed for specific oil formulas - throw in the wrong blend, and you could be setting yourself up for excessive burning, sludgy buildup, and accelerated wear.
Excessive heat
A severely overheating engine burns through oil rapidly, permanently damaging its chemical structure. This makes it less capable of lubrication and more viscous, which can cause leaks in previously sealed parts.
The red flags
Trying to determine if your car's craving for oil has become excessive? Here are some clues that it's time for a mechanic to take a look:
- Blue smoky exhaust = burning oil.
- Low compression readings.
- Carbon buildup on spark plugs/valves.
- Coolant takes on a murky oil-laced hue.
- Oil spots on the ground under your car.
- Engine overheating.
- An oil sensor or service light is on your dashboard.
Ignore those red flags at your own risk – they indicate a problem that could rapidly accelerate internal engine damage if left unchecked.
How professionals diagnose oil problems
Fault code diagnosis using an electronic tool is usually the first step in getting your vehicle's interpretation of the problem. P0524 is the fault code for low oil pressure—a generic code that tells us something's up.
Additional codes like P06DD, "Engine Oil Pressure Control Circuit/Open", and P0520, "Pressure Sensor/Switch Circuit", help us diagnose the problem further, providing the tool generates the code in the first place.
Regardless of fault codes, your mechanic will inspect the engine for visual signs of leaks and run the engine. A simple way to check for leaks is by running the engine and spraying suspected components with soapy water – air bubbles mean a leak.
An ounce of prevention
Regular maintenance is the key to preventing excessive oil consumption.
Using the proper oil type and changing it per the manufacturer's recommended service intervals goes a long way in keeping rings, seals, and other critical components living their best piston-pumping life.
A heavy driving style also exasperates engine wear, so if you want to prevent oil problems long-term, a steady driving style is best – accelerate smoothly and don't rev the nuts off the engine. Stick to speed limits, too.
Longmynd Service Station
We diagnose and fix excessive oil consumption issues in all makes and models. Call 01694 722626 to discuss your problem.