- Ensure that you are parked on a horizontal surface. - Ensure that the engine is switched off and left to cool for five minutes. - Remove the dipstick from the engine and wipe clean with a non-linting cloth. - Carefully push the dipstick back into its tube and then remove again. - Assess to see if the level of oil falls between the two specified points on the dipstick. - Never overfill your vehicle with oil past the maximum level, as this will harm the engine. We recommend that you always get your vehicle's oil changes carried out by a BMW Service Authorised Workshop to ensure optimum engine efficiency.