Odometer is an instrument that functions to measure the vehicle mileage and is usually used for periodic inspection of vehicle lubricant replacement. For companies that have a large number of vehicles (for example banks, travel agencies, etc.), vehicle lubricant replacement is an important thing to do, because if it is not maintained well it may cause fatal damage to the vehicle and can even endanger the passengers who use the vehicle. Therefore, it is built an integrated system that can give early warning for vehicle lubricant replacement by using microcontroller. This system is designed in two parts; the first part is a system that is planted in the vehicle, while the second part is a system that is planted in the garage. Both systems are tested by using several scenarios, namely calculating the combination of observation parameters consisting of the size of data being sent, angle and distance that are formed between the two systems, and a barrier that may occur between the two systems. The test results showed that the angle smaller than of 30° provides correct response time and data validity between the two systems, while the angle bigger than of 30° produces an error in the data, even the data cannot be accepted by the system in the garage. Data transmission of 2-byte requires 1 ms longer time compared with the data transmission of 1 byte. Meanwhile, distance and barrier between the two systems relatively have no impact on response time and data validity; except for a distance of over 700 cm, in which the data is not received in the garage system.
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