Q: Oil burning off 1 1/2 quarts every 200 miles

asked by on September 14, 2016

After my pickup was leaking oil, I replaced all of the gaskets and seals that were leaking. My pickup now has a spotless engine. But after this, the oil kept reducing by 1 ½ quarts every 200 miles. I changed the PCV valve to see if that was the cause, but that did not make any difference. When I looked at the oil, it looks normal in color and consistency and so does the coolant. The exhaust is not smoking. Running a compression test, without oil, was 120-130 psi on all cylinders. It seems to me that burning 1 ½ quarts every 200 miles would be showing some smoke. I am using old oil because purchasing new oil on a constant basis was getting too expensive! I am wondering if perhaps it is running a little rich and that is why it’s burning oil so quickly. What is your advice for fixing this problem?

Hello there, thank you for asking about your 1994 Isuzu Pickup. For your vehicle, minimum compression is 114 PSI and all cylinders should read within 70% of each other. So, according to your results, compression is good. My guess is that the clearance between the valve guides and valves is excessive or that the valve guides seals are worn. Either scenario could result in an engine that sucks down oil but still has good compression. Either way, a quart and a half every 200 miles means something is wrong, very wrong. I suggest you have a professional, such as one from YourMechanic, diagnose your low oil problem and repair your truck firsthand.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Oil burning

Hello. Oil can only get in to the cylinder one of two ways. Oil can get past the piston rings from worn or seized rings on the pistons. There is even a possibility of broken rings. The other way oil...

My car is leaking coolant and the heat won't work

Hi there. From the description you have provided, this needs to be repaired before it turns into a catastrophic and expensive repair. The coolant leak could be a radiator hose, a heater hose, a bypass hose, the water pump, the...

I own a 2010 mini cooer engine locked

There are many possibilities for a stall/no start. I suspect that may be related to the oil change. You need to see if the oil is full and the oil filter is the correct one. If the engine locked up,...

Related articles

How to Buy a Good Quality Gasket
There There are a wide variety of gasket types on a typical vehicle, from head gaskets which are installed between the cylinder head and the engine block to engine gaskets which seal out harmful elements and keep the engine safe...
Symptoms of a Bad or Failing Differential Gasket
If you find traces of oil on the underside of the differential, puddles of fluid, or whining sounds, you may need to replace the differential gasket.
How to Find and Repair a Brake Fluid Leak
The vast majority of passenger vehicles on the road today use hydraulic brake systems to operate their brakes. Most braking...