What mileage is TO-0: terms and regulations

The first maintenance service known as TO-0It is usually carried out after the engine is run-in, when the vehicle mileage reaches 1000-3,000 kilometers. It is during this period that the primary grinding of all rubbing parts of the power unit and transmission occurs, which requires a mandatory replacement of motor oil to remove metal shavings. Neglecting this stage can lead to accelerated wear of the cylinders and a decrease in engine life, so you can not ignore the manufacturer's recommendations for an early visit to the service.

Many new car owners mistakenly believe that the warranty period exempts them from any action up to 15,000 km, however, the regulations of most brands, such as the one in the UK, are not applicable. Hyundai, Kia or LadaIt clearly states the need for an interim inspection. Unlike a full-fledged planned maintenance, zero maintenance is more diagnostic in nature and is aimed at identifying factory defects that could manifest themselves during initial operation. It is important to understand that the refusal to pass TO-0 in an authorized center can become a formal reason for removing the car from the warranty.

The time of work depends not only on the mileage, but also on the time elapsed since the purchase, usually 3 months or 2000 km (depending on which comes first). As part of this procedure, the masters check the tightening of critical compounds, the level of technical fluids and the absence of leaks that could have formed after the first thermal expansions and compressions of parts. The key difference between TO-0 is the lack of replacement of air and cabin filters.This is because they can reach the first scheduled visit.

Regulated mileage and time intervals

Determining the exact mileage for zero maintenance requires reference to the service book of a particular car, since the standards differ significantly from manufacturer to manufacturer. For domestic cars and the budget segment of foreign brands, the range from 1500 to 3000 kilometers is considered the norm. More expensive brands can increase this interval to 5000 km or completely abolish the concept of TO-0, combining it with the first scheduled maintenance.

Time is also critical, especially if the car is used infrequently or for short trips around the city. The oil in the engine oxidizes and loses its properties even when parked, so there is a time limit - usually 3 or 6 months from the date of sale. If you have not run the necessary mileage during this period, you still need to visit the service for inspection.

• 🚗 1,000–2,000 km The standard range for most budget cars and Lada models.
• 🚙 3000–500,000 km - typical for some models of Kia, Hyundai and Chinese brands.
• ⏱️ 3 months - the maximum time interval for many brands, after which a visit is mandatory regardless of the mileage.
• 📅 6 months It is less common, usually in premium brands, where the service interval is 15,000 km.

It should be borne in mind that when operating in difficult conditions, which include traffic in dense urban traffic, the mileage to the first service is better to reduce. In such modes, the engine operates on unheated oil, which contributes to a more active formation of emulsion and wear products. Early replacement of lubricant in this case is a preventive measure to protect expensive nodes.

List of main works at zero TO

The main purpose of the visit to TO-0 is diagnostics and prevention, not a deep replacement of consumables. The central element of the procedure is the replacement of motor oil, which during the run-in is saturated with metal microparticles from rubbing piston rings and liners. Together with the oil, the oil filter necessarily changes, which delays the bulk of contaminants.

In addition to replacing lubricants, mechanics conduct a thorough inspection of the underhood space and chassis. Particular attention is paid to the condition of hoses, pipes and places of their connections, where microcracks or weakening of clamps could appear after heating and cooling cycles. Checking the levels of cooling and brake fluids is also included in the mandatory list.

Diagnostics of electronic systems allows you to identify errors that may not have caught fire on the dashboard, but are already recorded in the memory of the ECU. Specialists read the codes of malfunctions and, if necessary, carry out the adaptation of the throttle or check the operation of the sensors. This helps to eliminate minor failures before they develop into a serious breakdown.

• 🔧 Oil replacement in the engine to synthetic or semi-synthetic sesuai specifications.
• 🛢️ Installation of a new filter for cleaning the lubricating liquid.
• 🔍 Visual examination for antifreeze leaks, fuel and oil.
• 🔩 Stretching of threaded joints in the exhaust system and suspension.

It is important to note that the air filter is rarely changed at this stage, as it is polluted more slowly. However, if the car was operated in conditions of heavy dust, the master may recommend its replacement or purge. All the work performed is recorded in the service book with the indication of the mileage and date.

Differences between TO-0 and the first scheduled maintenance

Many drivers confuse zero service with the first planned TO-1, but there are fundamental differences in the scope of work and cost. TO-0 is rather a formal run-in procedure aimed at checking the condition of the car after the initial period of operation. TO-1 is a full-fledged service with the replacement of a large list of consumables.

⚠️ Note: Missing TO-0 does not always lead to immediate failure, but can cause a refusal in warranty repair of the engine in the future.

In the first scheduled maintenance, which is usually carried out on 15,000 km, the list of works is much wider. In addition to oil and filters, cabin and air filters are often changed here, brake pads are diagnosed, the battery and spark plugs are checked (on some brands). The cost of TO-1 is always higher due to the more parts to be replaced and the normal operating hours.