How many miles before timing belt replacement on a 2004 Kia Sorento. recommends to replace at 40000 due the engine being an interfernce engine.?

According to the Kia Sorento maintenance schedule, the timing belt should be replaced at 60,000 miles or 6 years, whichever comes first. However, some mechanics may recommend replacing it sooner, at around 40,000 miles or 4 years, due to the engine being an interference engine.