Car Talk: How soon is too soon to add highway miles to new cars? | News, Sports, Jobs

Car Talk: How soon is too soon to add highway miles to new cars? | News, Sports, Jobs

Ray Magliozzi, syndicated columnist

Dear Car Talk: Is this an old wives’ tale or is it true? I’ve been under the impression for over 50 years that it is a good idea to get a new car out on the highway as soon as possible. I understood that it helped to get the car to a good operating temperature for an extended period of time on the highway, and that this would provide a good seal for all gaskets.

I did this with my 1973 Pinto (I know, one of your favorites), and it ran very well until I sold it in 1982 for $350 with a hole in the floorboard (good view of the road). I bought a 1985 Chevy Astro Van (I think this is one of your favorites, too, right?) and within a few days, drove it to Colorado and back. I recently purchased a brand-new Honda CR-V and have already put about 100 highway miles on it.

My experience has been that I have had relatively few major problems with all of the cars that I have purchased after doing this. Have I just been lucky? Or am I right about this? — Tom (’73 Pintos were the best)

Well, now that I have a complete automotive history on you, Tom, I’ll be able to refer you to the appropriate support groups.

I don’t think your early highway driving has anything to do with your automotive good fortune, Tom. If you can call owning a Pinto and an Astro Van in the same lifetime good fortune. If your cars did do better than other Pintos and Astro Vans, it was probably because you drive gently and take good care of your cars.

In fact, new car manufacturers instructed owners to do the exact opposite of what you did.

When you bought those two beauties, in the ’70s and ’80s, carmakers recommended that you NOT drive their new cars on the highway for extended periods. They wanted you to vary the engine speed constantly during the first 1,000 miles and not drive at sustained highway speeds. And many of them wanted you to stay below 60 mph or so.

That was known as the “break in” period. Or as Pinto owners used to call it, the “break down” period. It was thought that varying the speed of the pistons would help the new cylinder rings “seat” or conform to the exact shape of the cylinder walls and thereby prevent oil burning later on.

That’s because manufacturing just wasn’t very good back then. The spaces between fitted parts (called tolerances) were huge by today’s standards. For the last 25 years or so, tolerances have been tiny in comparison. So there’s no longer any need to “seat” the rings. They come seated. How’s that for progress? They’re actually making parts that fit together perfectly, right from the factory.

When you combine that with the huge improvements in oils over the last few decades, you can take your new CR-V right off the lot and drive it in the Baja 500. It’s all set.

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