90ENGINE OIL Adding engine oil Only top up oil when the oil level has dropped to just above the lower notch of the dipstick, but before it goes below this mark. MINI engines are designed to operate without oil additives; the use of addi-tives could lead to damage in some cases. This also applies to the CVT, the manual transmission, and the differential. <The manufacturer recommends that you have the oil changed only at your MINI center.Continuous exposure to used oil has caused cancer in laboratory testing...