Motor Expo 2026

Many might wonder.. do modern red-plate new cars —since technology has advanced so much —still need to "run-in" for the first 1,000 km like older cars? For anyone who just got their first car and has no experience driving, read this article now...

Although manufacturing machinery is very precise, there is still a chance of engine imperfections. Therefore, it is advisable to run-in for the first 1,000 km to extend the lifespan.   If not run-in, long-term problems can occur with the car, such as the engine becoming loose faster than usual. The best method is: for the first 1,000 km, do not keep the engine speed above 3,000 rpm for a long time, and do not use engine speeds exceeding 4,500 rpm. However, you can accelerate to overtake the car in front for short periods.  

Currently, manufacturing technology in the automotive industry has advanced significantly. Most manufacturing machinery is controlled almost entirely by computer systems. Therefore, the resulting components are much more precise, accurate, and consistent than in the past. The cylinder surface is also well-made. When assembled with the piston, problems with the piston pressing against the cylinder (meaning some pistons are manufactured slightly larger than normal, and some cylinders are manufactured slightly smaller than normal) rarely occur. Most issues, if not run-in, tend to be long-term problems, such as the engine becoming loose faster than usual, etc.

In reality, cars that have just been assembled from the factory, especially the “engine” should be run-in before being delivered to customers. However, due to various constraints such as time or different costs, it is not possible to run-in for customers (except for some very expensive car brands). Therefore, only basic testing can be performed.  

The correct practice is: when you get a new car, for the first 1,000 km:

-Do not use engine speeds exceeding 4,500 rpm.

-However, if necessary, such as for short bursts of acceleration to overtake, it can be done.

-After that, gradually increase engine speeds for short periods.

-But do not keep the engine speed above 3,000 rpm for extended periods.

-After the 1,000 km run-in is complete,

-Open the hood to check for any oil stains. If there are none and the engine shows no abnormal symptoms, you can use the new car like any other car.

Source: autoinfo.co.th /Article by : Withawin Traiphitt / Magazine Formula October 2016 issue Column : Is that really true? 

Thanks for the illustrations from: Phi Nong Long Rot