#2624: How to Know if You Have a Cracked Head
The Best of Car Talk
The Best of Car Talk Mar 24, 2026
#2624: How to Know if You Have a Cracked Head

#2624: How to Know if You Have a Cracked Head

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#2624: How to Know if You Have a Cracked Head
Peugeot 504
Car

Peugeot 504

The Peugeot 504 is an older Peugeot model. The hosts mention it because it’s been sitting in a shop, and getting the brand back in the U.S. could make it easier to find support and parts.

Concept

US market

The “US market” just means selling cars in the United States. Coming back usually involves making sure the cars can be sold legally and supported with parts and dealers here.

Concept

dealerships

Dealerships are the stores where you buy cars and usually get them serviced. Owning or buying dealerships can give a company a ready-made way to sell and maintain cars.

Subaru Uncharted
Car

Subaru Uncharted

“Subaru Uncharted” doesn’t clearly match a specific Subaru model name. In this context, it sounds like the podcast is describing an “uncharted wilderness” situation. So it’s likely being used as a phrase, not a particular car you can look up by that exact name.

Concept

buy three new tires

They were thinking of replacing only three tires. That can be tricky because the new tires may grip differently than the older one.

Term

same tread

“Same tread” means the tire grooves are worn to about the same level. That helps the tires behave more the same on the road.

Term

handling in the rain

Rain performance depends heavily on tire tread design and tread depth, which help channel water and reduce hydroplaning risk. Mismatched tires can create uneven wet grip, making the car feel unpredictable.

Concept

traction

Traction is the grip force between the tire and the road. If left and right tires have different tread or width, traction can become uneven, which can cause the car to feel unstable or not track straight.

Term

different manufacturers tires

You can sometimes mix tire brands if they’re the same size and worn similarly. But different brands can still grip a little differently, especially in rain or snow.

Term

tread is not worn out

Tread is the rubber pattern on the tire. If it’s still deep enough, the tire can grip the road better, especially when it’s wet.

Term

rain and snow

Tires don’t behave the same in every weather. Rain and snow are where tire differences can show up most in grip and stopping.

Term

spare

A spare is the backup tire you keep in case of a flat. If you end up using it, it may not match the other tires, which can change how the car drives.

Term

tire rotation

Tire rotation means moving your tires to different wheel spots. This helps them wear more evenly, so you don’t have to replace them as soon.

1980 Buick Le Sabre
Car

1980 Buick Le Sabre

This is the specific car the caller has: a 1980 Buick Le Sabre. It matters because different cars have different common problems, and the show is talking about how to spot a cracked head.

Term

burns oil

If a car “burns oil,” it means the engine is using oil internally, not just spilling it outside. That can lead to the oil level dropping and sometimes smoke coming out the back. It’s different from a leak, where oil drips onto the ground or onto engine parts.

Concept

denial phase

“Denial phase” is a joke about how people sometimes ignore bad signs at first. Here, it means not wanting to believe the car is burning oil, even when the symptoms suggest it. The fix usually starts with admitting there’s a real issue and checking properly.

Term

drain plug

The drain plug is a small bolt at the bottom of the engine that lets you drain the old oil out. Removing it would empty the oil, which is why the story treats it like someone could “steal” oil.

Part

valve covers

Valve covers are the covers on top of the engine that keep oil in and protect the valve mechanism. Taking them off lets you see the parts that open and close the valves.

Part

rocker arms

Rocker arms are levers inside the engine that help move the valves up and down. They’re part of the system that controls airflow into and out of the engine.

Concept

brittle and they disintegrate

Over years, rubber seals can dry out and fall apart. When that seal fails, oil can start getting into the cylinders where it shouldn’t.

Part

valve guide seals

Valve guide seals are tiny seals in the engine that keep oil from getting into the cylinders where it shouldn’t. If they fail, the engine may burn oil and smoke, which can point you toward a specific repair.

Term

battery was dead

The battery is like a rechargeable power tank. If you leave the lights on, it can run out of power, and the engine won’t start.

Term

12 volts

Most vehicles run on a 12-volt electrical system. When mechanics apply 12 volts during testing, they’re basically simulating what the battery does in the real vehicle.

Part

starter motor

The starter motor is the part that uses electricity to crank the engine. If it’s not the starter, then the problem is usually the battery or the connections that deliver power to the starter.

Term

five speed

“Five speed” means the truck has five gears. It can affect how the truck behaves when the mechanic tests it.

Term

short bed

A “short bed” refers to a shorter cargo bed length on a pickup truck. It’s relevant to buyers because it changes usability, parking/storage convenience, and sometimes the truck’s overall proportions.

Term

compression test

A compression test checks whether each cylinder is sealing properly. If one cylinder has much lower pressure, it can point to internal engine problems.

Term

oil leaks

Oil leaks are when engine oil escapes from somewhere it shouldn’t. Mechanics look for them because they can show that a gasket or seal has failed. If there’s no oil leaking, that’s one less clue that something is seriously wrong.

Concept

insurance rental car

After an accident, your insurance may help you get a temporary replacement car. That way you can still get around while your own car is out of service.

Toyota Land Cruiser
Car

Toyota Land Cruiser

The Toyota Land Cruiser is a big Toyota SUV that’s built to handle rough roads and last a long time. Here it’s mentioned to describe the kind of car someone might be driving.

Jeep Grand Cherokee
Car

Jeep Grand Cherokee

The Jeep Grand Cherokee is an SUV. It’s the kind of car that’s easier to climb into because the seat sits higher, so it can feel less awkward for someone getting in.

Concept

weekly rental

A weekly rental means you rent a car for about a week. The point here is to try the car out and see if you like it before you decide.

Term

doors locked

Locking the doors means keeping the car secure so strangers can’t get in. They’re joking that if the doors weren’t locked, people might have tried to get in.

Brand

cars.com

Cars.com is a website where people shop for cars online. The show mentions it because it hosts the Car Talk content.

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