Adding boron to motor oil presents several challenges. Firstly, boron tends to react with other elements in the oil, leading to the formation of unwanted deposits or sludge. Secondly, achieving a stable suspension of boron particles in the oil can be difficult, as they have a tendency to settle at the bottom. Additionally, maintaining the desired concentration of boron throughout the oil's lifecycle poses a challenge, as it can degrade or become ineffective over time due to temperature and operating conditions. These challenges require careful formulation and testing to ensure that boron can be successfully added to motor oil without compromising its performance or causing undesirable effects.