use the fuel system cleaner no the fuel injection cleaner, its stronger and will be good for the entire fuel system including the o2 sensors and other parts of the system. if you want insurance after, continue using chevron or shell premium and drive the car for 150,000 without issues. enjoy. 1 2. A BMW 7 Series will cost about $14,453 for maintenance and repairs during its first 10 years of service. This is more than the industry average for luxury sedan models by $2,492. There is also a 40.39% chance that a 7 Series will require a major repair during that time. E-85 ethanol is used in engines modified to accept higher concentrations of ethanol. Such flexible-fuel vehicles (FFV) are designed to run on any mixture of gasoline or ethanol with up to 85% ethanol by volume. E85 has an octane rating higher than that of regular gasoline’s typical rating of 87, or premium gasoline’s 91-93. year make model style fuel type 2019 BMW 5 Series 530e iPerformance 4dr Sedan (2.0L 4cyl Turbo gas/electric hybrid 8A) premium unleaded 2019 BMW 5 Series 530e xDrive iPerformance 4dr Sedan AWD (2.0L 4cyl Turbo gas/electric hybrid 8A) premium unleaded BMWs operate at higher compressions than everyday cars, and premium gasoline is called for. The higher the octane number, the more resistance to uncontrolled combustion. In a gasoline engined car, the air and fuel are squeezed together (compressed), and, as you know, squeezing stuff together generates heat. ZnEs.