No, It isn't advisable to substitute power steering fluid ATF with frequent ATF inside your BMW. Power steering fluid ATF is especially formulated to satisfy the necessities of the power steering method, making certain best general performance and protection. Usually use the advised power steering fluid ATF specified by BMW. https://juliusyhfrw.blogoxo.com/27377727/types-of-power-steering-fluid-for-bmw-an-overview