What is a head gasket?
A head gasket sits between your car’s cylinder head and the engine block. Its main job is to keep a fluid-tight seal between the block and the cylinder head so that coolant flowing through the coolant passages and oil in the engine block don’t leak into the combustion chambers. Without this seal, your engine can’t cool and lubricate itself properly, which may cause even more significant damage down the road.
Head gaskets are typically made of high-strength steel to withstand the intense heat of an engine, but they can also be made of rubber, silicone, cork, felt, nitrile, fiberglass or Teflon.
How much does it cost to replace a head gasket?
The average cost to replace a head gasket is between $2,475 and $3,246, according to RepairPal. However, costs can vary depending on the vehicle and where you live.
The table below shows cost estimates for vehicles from different automakers. Note that we chose older vehicles since head gaskets are designed to last a long time. All quotes are for Tulsa, Oklahoma. Quotes are accurate as of Feb. 26, 2026.
| Vehicle | Total cost estimate |
|---|---|
| 2010 BMW X5 (xDrive30i) | $3,576 to $4,974 |
| 2011 Chevrolet Cruze (LT) | $1,735 to $2,396 |
| 2015 Mazda MX-5 Miata | $1,676 to $2,249 |
| 2018 Buick Encore | $1,846 to $2,499 |
| 2020 Lexus RX350 (AWD, both sides) | $5,964 to $8,109 |
Parts vs. labor costs
Head gasket replacement parts are generally closer in cost across vehicles, while labor costs can vary significantly. This makes sense because some vehicles make it relatively easy for a mechanic to replace the head gasket, while others require a more extensive process.
Tom Bonfe, owner of Bonfe's Auto Service and Body Repair in St. Paul, Minnesota, explained why costs can vary so much.
“Head gasket jobs have been increasingly more challenging due to the design of newer engines,” Bonfe said. “Turbocharged models [...] are especially challenging from a labor perspective. Foreign brands are also notorious for requiring lots of labor to get the job done right.”
Head gasket jobs have been increasingly more challenging due to the design of newer engines.”
It can help to call around for quotes before you get any work done on your car. Shops may have different labor rates or estimates for how long the job will take.
» RELATED: 10 most expensive car repairs
How to tell if you have a blown head gasket
People describe a head gasket as “blown” when the seal between the head and the block of the engine fails. A head gasket is designed to seal off the channels between the head and the block where oil and coolant flow. Once the gasket is damaged or blown, coolant and oil can mix and cause various issues.
Unlike some engine problems, blown head gaskets usually present themselves in fairly obvious ways. If you encounter any of the following problems, you might have a blown head gasket.
White smoke coming from your exhaust
If you see white smoke coming from your tailpipe, it’s time to replace the head gasket. White smoke happens when a damaged gasket allows coolant to slip into the combustion chambers, where it's burned and expelled as white smoke. The color of the smoke matters because coolant burns white (unlike fuel), so white smoke is a clear sign of a blown head gasket.
Milky-looking oil or coolant
If you check your oil or coolant and see a foamy substance that looks like a chocolate milkshake, you may have a blown head gasket. This occurs when oil and coolant mix due to a damaged head gasket, letting these fluids combine. Once coolant enters the engine, it gets whipped up by engine components and turns into a foamy mess. Unfortunately, if your car has this issue, it’s most likely a blown head gasket.
Bubbling in the coolant reservoir
If you look in your coolant reservoir and see bubbles, you have a blown head gasket. The coolant reservoir is usually a plastic tank near the front of the engine bay near the radiator. The bubbles come from compressed air in the cylinders that enter the cooling system.
Mysterious coolant loss without leaks
If you’re losing coolant from your cooling system but can’t find the missing coolant on the ground or around your motor, you may have a blown head gasket. Unlike with a leaking hose or a failing water pump, you won’t see escaping coolant when a head gasket fails. This is because the coolant is vaporized and burned off in a combustion chamber or pooled inside.
Overheating
There are many reasons why your car may overheat, such as a stuck thermostat or impacted radiator, so overheating isn’t necessarily unique to a blown head gasket. However, if oil and coolant are mixing, or if your coolant is burning off and you don't notice, your engine may overheat.
Is a head gasket covered under warranty?
Most factory warranties and extended warranties should cover the cost of a head gasket replacement since this typically falls under a powertrain warranty. A powertrain warranty covers components like a vehicle's engine, transmission and drivetrain.
However, note that some warranty providers may look for reasons not to cover the replacement, like if you’ve modified your engine for performance or not kept up with regularly scheduled maintenance.
For example, Michelle, a reviewer from California, said that their warranty provider required proof of maintenance after a blown head gasket.
“I got my car diagnosed and the repair shop indicated that I had a blown head gasket,” Michelle said. “The warranty company was asking for proof of Ford oil change records. We perform routine oil changes ourselves on all of our vehicles and we explained that to the repair shop. [...] Now I'm waiting on a response and obviously still don't have my car almost a week later.”
Also, note that extended warranties don’t cover preexisting conditions. That means you’re out of luck if you buy one after your car starts showing signs of a bad head gasket.
» LEARN: What to know about car warranties
Is it worth it to fix a blown head gasket?
Deciding whether to proceed with an expensive repair can be a daunting decision. Try balancing the cost of a head gasket replacement against the function you’ll get out of your vehicle once it’s running again. If your vehicle is in otherwise good condition and has plenty of life left in it, replacing a head gasket should be worth it in the long run.
However, if your vehicle is old or not in good condition, fixing the head gasket may be more trouble than it’s worth. Keep in mind that vehicles with blown head gaskets may also overheat, causing additional damage to the engine that could cost you even more to fix.
FAQ
How many miles do head gaskets last?
Head gaskets typically last at least 100,000 miles, though they may be able to last longer with proper maintenance and care.
Can you still drive a car with a bad head gasket?
You can potentially drive with a blown head gasket, but you may suffer further engine damage and risk overheating due to coolant loss.
Are there alternatives to replacing a head gasket?
It’s possible head gasket sealers may help remedy a blown head gasket for a short period of time. These products work using special chemicals activated by the heat from your vehicle’s cooling system. Once introduced into the cooling system, usually via the radiator, a head gasket sealer works its way into the tiny gaps in a busted head gasket and theoretically seals it up. We recommend speaking with a licensed mechanic to get their recommendation before trying this type of product.
Bottom line
Dealing with a blown head gasket can be expensive. If your car is no longer under a factory or extended warranty, you’ll generally need to pay for it out of pocket. Call at least a few different repair shops for estimates to help you decide whether a replacement would be worth it.
Article sources
ConsumerAffairs writers primarily rely on government data, industry experts and original research from other reputable publications to inform their work. Specific sources for this article include:
- RepairPal, “Head Gasket Replacement Cost Estimate.” Accessed Feb. 26, 2026.
- RepairPal, “Get a Free Car Repair Estimate.” Accessed Feb. 26, 2026.
