Skip the auto shop - Our mechanics make house calls

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

asked by on

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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

Q: How long does it take to put on a compressor?

Hey there, thanks for writing in about your 2009 Dodge Journey. The book time for this is typically 1.9 hours and includes recovering refrigerant, replacing the compressor, and recharging the system. It does not include other components or flushing system...

Q: Brake pedal goes 3/4 way to floor

Hello there. This is a more unusual problem, especially given the amount of parts you have replaced. In most cases, the pedal travel is due to either the master cylinder or the brake booster, sometimes both. Given that these...

Q: What other cars could fit my engine?

The only other direct swap would be the 2003 Ford Ranger. That is what the interchange guide states. You may be able to use a different year Ranger or B2300 if you swap over everything but the block and head....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...