Dear Car Talk:

I have a 2018 Toyota RAV4. My car has 10,000 miles on it, and for the last 10 months, most of my driving is under 45 mph and in residential neighborhoods.

Do I need to take it out on the highway once a week to clean out the carburetor? Or does the computer take care of that? — Jill

You certainly can clean out the carburetor on your RAV4 if you want to, Jill. But you’re going to have to find it first. I’d start by looking in 1979.

I don’t think Toyota’s made a car with a carburetor for at least 25 years.

Like all gasoline engines these days, Jill, your car has fuel injection, which is more precise, more efficient and more reliable than a carburetor. And more expensive to fix if anything does go wrong with it, for which my IRA is grateful.

Carburetors were so crude and gasoline so dirty back in the day, that the small passages inside the carburetor could get blocked up with dirt. And it was thought that opening the throttle for some period of time would keep things clear and moving. Sort of a carburetor high-colonic.

It might have helped a little, decades ago when gasoline was much dirtier than it is today. But it’s obviously completely irrelevant now.

There are reasons to drive your car regularly. It keeps the battery charged up. It prevents flat spots on your tires. It keeps lubricated parts lubricated. But 45 mph is more than enough to do all that, and there’s nothing further you need to do or worry about.

Dear Car Talk:

I own a 2019 Volkswagen Golf Sportwagen with the 1.8L turbo engine. In the owner’s manual, it calls for 5W-40 or 5W-30 engine oil.

I brought my car to a local franchise chain to have the first oil change done. Let’s call them ... “Honest Bob’s.” When “Honest Bob” performed the oil change, for which I was charged $60, they put 0W-20 in my car. When I discovered this after the fact, they insisted they did it correctly and, according to Alldata, all engines can take 0W-20, contrary to what Volkswagen states.

I insisted they fix it and put the right oil in, which they