E60 platform
2008 BMW 550I
Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2008 550I.
Transmission Automatic (S6)
The 2008 BMW 550i is an E60-platform model paired with an Automatic (S6) transmission, returning an EPA-estimated 15 city and 23 highway mpg for an 18 mpg combined average while requiring 8.5 quarts of API SJ oil in 15W-40, 10W-40, or 10W-30 viscosities. Examining the model's documented complaint history from 2011 to 2015 reveals a significant reliability peak of 172 issues in 2011 that dropped to a low of just 6 in 2014. Since the 2008 model year predates this tracked spike, it sits at the forefront of the model's reliability curve, meaning researchers must evaluate it as a precursor to the platform's most heavily complained-about era.