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Rise in Catalytic Converter Theft, Conventional vs. Synthetic Oil, Mixing Gasoline

Rise in Catalytic Converter Theft, Conventional vs. Synthetic Oil, Mixing Gasoline

WCCO's Car Care Mar 14, 2026 26 min
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About this episode

Nick Stoffel from Lloyd's Automotive discusses the rise in catalytic converter thefts, emphasizing prevention and the cost of replacements. He explains the differences between conventional and synthetic oils, recommending oil change intervals based on vehicle age and oil type. Listeners call in with questions about brake fluid maintenance, transmission issues, tire pressure sensors, and fuel octane mixing. Nick also touches on battery technology improvements and the importance of regular vehicle inspections, especially with harsh winter conditions approaching. The episode blends practical advice with real listener concerns, offering insights into common car care challenges.

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Technical Too Afraid to Ask
Car

Lucid Air

"...weather that's coming up and as we're talking off air, you know, we have to move all those cars and pul..."

The Lucid Air is a fancy electric car made by a company called Lucid Motors. It runs on electricity instead of gas and can drive a long way before needing to be charged. People talk about it because it has lots of modern features and is very fast.

Term

catalytic converter theft

"A texter asked, I remember you mentioning, every time we started bringing up the idea of a catalytic converter thefts, it starts happening. Well, I tell you what, the texter is right. They've been reading that those things have been on the rise, those thieves have been at it again. Have you seen any evidence of that? Yeah, we've seen a couple and I don't know. I don't know why we can't grow out of this and there's a better path in life than stealing those things. It's really unfortunate. It's expensive. It's hard on the customer, hard on the vehicle and there's no real gain from it."

Some bad people steal a part under your car called the catalytic converter because it has valuable metals inside. This part helps clean the car's exhaust. If it's stolen, fixing it can cost a lot of money.

Term

aftermarket

"So it really depends on the making model. A lot of times if it's an after converter or if it's an aged vehicle or some aftermarket options that are okay, that are much more reasonably priced. But the price is, I would say, almost proportional to the amount of that precious material that's in there that they're trying to take. So a lot of times those aftermarket converters are a fraction of the price, but their longevity and the quality of the part might also be a fraction."

Aftermarket parts are parts made by other companies, not the car maker. They can cost less but might not work as well or last as long as the original parts.

Term

original equipment

"So if you have a newer vehicle and something unfortunate like this happens, insist on your insurance company uses original equipment, part of all possible, if it's within your plan and your budget, because that'll keep your car running the way it should for a long time forward."

Original equipment parts are the same parts that came with your car when it was new. They fit perfectly and work just like the car maker intended.

Term

brake fluid

"A lot of folks are using the text messages. Basically, this paragraph, I can break it down to asking you about brake fluid. What can happen to brake fluid and how often should brake fluid be changed? Tell us about how brake fluid can go bad. Well, there is, once again, as we always talk about our maintenance schedule, it's in there. It's probably every few years, we oftentimes change the fluid when we do a brake service or a brake repair replacement. The fluid is hydroscopic, meaning it'll absorb moisture and dirt. You can see when it gets very dark in color, it's at the end of its life. That dirt and that moisture can then affect the rubber seals and possibly create some rust and some of those calipers or master cylinders. It's not something we do often, so it's often forgotten, but every few years or every time we have a brake job done, talk to them, have them flush out that brake system to remove the fluid from the master cylinder, put fresh fluid in, and then they'll extract all the fluid out of the lines to have good clean fluid through the whole system and just back to new again. So that's not overly complicated. It adds a little bit to the cost of the brake job, obviously, but I think over the long haul, that's a good piece of maintenance I've done."

Brake fluid is a special liquid in your car that helps your brakes work when you press the pedal. Over time, it can get dirty and hold water, which makes your brakes less safe, so it needs to be changed sometimes.

Term

hydroscopic

"The fluid is hydroscopic, meaning it'll absorb moisture and dirt. You can see when it gets very dark in color, it's at the end of its life. That dirt and that moisture can then affect the rubber seals and possibly create some rust and some of those calipers or master cylinders."

Hydroscopic means something can soak up water from the air. For brake fluid, this means it can get water inside, which is bad for your brakes.

Term

oil change

"You know, we talk about cars these days who seem to be, you know, talk about low maintenance, and again, you and I talk incessantly, and the listeners ask about oil changes, how many thousands of miles, and they have extended type of oil, we can go 20,000 miles, but we don't recommend that. But what about some of these other things? Do the newer cars, like Coolant, for example, do they need to be changed as often, like spark plugs, what, every 100 and some thousand miles? What about Coolant in cars? No, I would say that's very true as they've, with chemistry and science, and as cars have improved, a lot of those maintenance items, those fluids, as you mentioned, you know, Coolant, transmission fluid, power steering fluid, brake fluid, they all last longer because the cars are built better. The only problem with that is that we're more likely to forget about them. So it's important that we do them. You get on a regular schedule. When you take it to your shop, you know, people talk about, we get text or they're asking, they're collars. You know, I don't drive 5,000 miles in a year. How often should I change my oil? Well, I would answer that now and say, man, get your car in twice a year, because it's not just the oil that needs to get looked at, but the whole vehicle. All those other fluids, steering, suspension, all those components should be assessed twice a year. I like to say spring and fall is the minimum. Obviously, if you drive more, you need to get it more often. But at bare minimum, you have the car in twice a year. Maybe the oil's changed once only. You know, it really depends on your conditions. But I would say that we need to do a better job of having a more regular inspection of our vehicles."

An oil change means putting new oil in your car's engine so it runs well and doesn't get damaged. Even if some cars can go longer between changes, it's good to check often.

Term

coolant

"But what about some of these other things? Do the newer cars, like Coolant, for example, do they need to be changed as often, like spark plugs, what, every 100 and some thousand miles? What about Coolant in cars? No, I would say that's very true as they've, with chemistry and science, and as cars have improved, a lot of those maintenance items, those fluids, as you mentioned, you know, Coolant, transmission fluid, power steering fluid, brake fluid, they all last longer because the cars are built better. The only problem with that is that we're more likely to forget about them."

Coolant is the liquid in your car that helps keep the engine from getting too hot. Newer cars use better coolant that lasts longer before needing to be changed.

Car

Acura Tl

"Well, good morning. I have a 2005 Acura TL with about 230,000 miles on it. And then noticing on occasion when I start it, it sort of kind of skips. You know, it sounds like it's almost speeds up a little bit."

The Acura TL is a fancy car made by Honda's luxury brand. The 2005 version is a comfortable sedan with a strong engine and nice features.

Part

flywheel

"I think on that vehicle, the starter gear might be slipping a little bit. I think I've seen that. It doesn't mean you're going to damage a flywheel or anything significant, I don't believe."

The flywheel is a big wheel inside your car's engine that helps it start and run smoothly. The starter gear pushes on it to get the engine going.

Part

starter gear

"I think on that vehicle, the starter gear might be slipping a little bit. I think I've seen that. It doesn't mean you're going to damage a flywheel or anything significant, I don't believe."

The starter gear helps your car's engine start by connecting to a big wheel inside the engine. If it slips, your car might have trouble starting sometimes.

Term

blinker fluid

"Just a reminder if you have any kind of a car care question. Some funny guy just said, how often do you change blinker fluid? I told him every six months."

Blinker fluid is a joke because it isn't a real thing. People say it to tease others who are new to cars.

Term

tire maintenance

"Every six months. And don't forget to change out your air and your tires too."

Taking care of your tires means making sure they have the right air, enough tread, and moving them around so they wear evenly. This keeps you safe on the road.

Term

winter storm warning

"That's right. All right, Nick, hang on. Before we do bring more information to you, I want to mention there is a winter storm warning that goes into effect. Four o'clock this afternoon does include the entire Twin City area, among areas."

A winter storm warning means bad snow and wind weather is coming, so it's safer to be careful or stay inside.

Company

Lloyds Automotive

"And welcome back to CCO's Car Care Show. Denny along here, along with Nick Stoffel, ASC certified technician at Lloyds Automotive in St. Paul. Nick, for those that need some help from you guys at Lloyds, how do we find you?"

Lloyds Automotive is a car repair shop where trained mechanics help fix and take care of cars.

Car

Honda Pilot

"Or the more miles you have in your car, the closer you should be to 3,000. This Tuster has a Honda Pilot with a 200,000 miles on it. And I think it's a fair question."

The Honda Pilot is a type of family SUV that is roomy and usually lasts a long time. This one has been driven a lot, with 200,000 miles.

Term

synthetic oil

"That being said, most vehicles that are new on the road today take a synthetic oil. That is usually like a 020, 016, 520 some cases, different weights, but it's a synthetic oil. And that I would say is definitely a 5,000 mile interval."

Synthetic oil is a special kind of oil made in a lab that helps keep your engine running smoothly for a longer time. It protects your car better than regular oil, especially in very hot or cold weather.

Term

conventional oil

"If your car still uses conventional oil, which would be a little bit an older vehicle, I would say the 3,000 mile interval is probably appropriate. And those make some models. It's timely to ask this one because a text came in a bit ago about conventional oil."

Conventional oil is the regular kind of oil made from natural sources that helps your car's engine run. It usually needs to be changed more often than synthetic oil.

Car

Chevrolet Traverse

"Yeah, there you go. I have a 2015 Chevy Traverse and this just started recently."

The Chevrolet Traverse is a big SUV that can carry families and lots of stuff. The 2015 version has a strong engine and can drive on either two or all four wheels.

Term

transmission fluid

"I'm thinking something with the transmission is at those two intervals, something's engaged and disengaging. It's a little slippage there. I think maybe I would have that fluid looked at, maybe have it serviced."

Transmission fluid is a special oil that helps your car's gears work smoothly. If it's old or low, your car might have trouble changing gears.

Term

scan tool

"A lot of times there's wear information within the scan tool. They can see if there's certain things are more worn, but it's unique at those two speed pinpoints."

A scan tool is a gadget that mechanics use to check your car for problems by reading its computer codes.

Term

drive axle

"Also, possibly a drive axle, the right frequency, the right load might make a little bit of a feel to it, a little wobble. But making note of it, as I always mentioned, get a journal, try to write down the speed down..."

The drive axle is the part that helps turn your car's wheels using power from the engine. If it's damaged, your car might shake or wobble when driving.

Term

oxygen fuel sensor

"That's one question. Or all regular. Does that affect the oxygen fuel sensor?"

An oxygen fuel sensor checks how much air is in the car's exhaust and helps the engine use the right amount of gas.

Car

Ford F150

"Here is a 2014 Ford F-150. My mechanic said it's fine, or rather, it's time to flush the differential."

The Ford F-150 is a big pickup truck that many people use for work or daily driving. The 2014 version is a popular model from a few years ago.

Term

differential flush

"My mechanic said it's fine, or rather, it's time to flush the differential. I was not so sure about that if I actually needed."

A differential flush means changing the special oil inside the part of your car that helps the wheels turn properly.

Term

tire pressure sensors

"Could it be the tire sensors that are the problem? Well, I would take an actual gauge measure the tire pressure level, compare them. Some sensors can go bad."

Tire pressure sensors are little gadgets inside your tires that check if they have enough air. Sometimes these sensors can break and give wrong warnings.

Term

drain plug

"But nothing's as good as gravity. Right. So you pull the drip plug and you let it drip till it's dry. That's the most efficient way."

The drain plug is a bolt at the bottom of the engine where old oil comes out when you change the oil. Letting oil drip out this way is the best method to get all the old oil out.

Term

idle relearn procedure

"Is it probably lost as idle setting? And I don't know exactly the procedure there, but there's a relearn procedure for the idle."

Sometimes after the car battery dies or parts are cleaned, the car needs to learn how to keep the engine running smoothly when stopped. This is called an idle relearn.

Part

throttle plate

"The other thing too might need a little maintenance that throttle plate. When the idle reset, when the battery went dead, it's not adjusted for the throttle body, which might be a little dirty."

The throttle plate is like a door that opens and closes to let air into the engine. It helps control how fast the engine runs when your car is stopped or moving.

Part

throttle body

"They can check and clean the throttle plate, throttle body. They can relearn the idle and it'll get you back on the road without any problem."

The throttle body is a part of the engine that controls how much air gets in. It helps the car run smoothly, especially when you stop or start driving.

Term

washer fluid

"Listener wants to know, are there differences in washer fluid? There is. And this kind of goes into the marketing part of the world. There's stuff that does better with bugs, stuff that does better when it's colder than colder, you know, differences."

Washer fluid is the liquid you spray on your windshield to clean it while driving. Some types work better for bugs or cold weather.

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