Just like conventional motor oil, synthetic engine oils will still burn. However, the rate at which it burns is significantly slower than traditional oils. This is because most synthetic oils are designed and formulated with special additives that not only ensure that they last for a long time between oil changes. But also, making sure that it's more resistant to excessive oil consumption and burning. Beyond that, synthetic oils offer better lubrication qualities and maintain reliable lubrication even after long hours of engine operation. Still, it's worth checking every once in a while to make sure that it's not burning too much.