General information Tires can affect fuel consumption in various ways, e.g., tire size may influence fuel consumption.
Check the tire inflation pressure regularly Check and, if needed, correct the tire inflation pressure at least twice a month and before starting on a long trip.
Low tire inflation pressure increases rolling resistance and thus raises fuel consumption and tire wear.
Drive away immediately
Do not wait for the engine to warm-up while the vehicle remains stationary. Start driving right away, but at moderate engine speeds.
This is the quickest way of warming the cold engine up to operating temperature.
Look well ahead when driving
Avoid unnecessary acceleration and braking.
By maintaining a suitable distance to the vehicle driving ahead of you.
Driving smoothly and proactively reduces fuel consumption.
BMW X3 Service & Repair Manual > HVAC: Refrigeration oil
2.0 REFRIGERATION OIL
OIL USED IN FREONÂ-CHARGED SYSTEMS
A mineral-based oil is used. The oil level in the compressor must be checked before filling an air conditioner
with refrigerant. It can be checked only if the system is without refrigerant.
Always check the oil level each time a new sys ...