While topping up the oil at that frequency may be annoying and possibly expensive, there is generally nothing to worry about. In the vast majority of cases, there is no need to flush the engine and flushing can be harmful.
Deb Deb Solopol Lime Hand Cleanser 2ltr - LIM2LT
Deb Solopol Lime Hand Cleanser 2ltr - Natural & Non Abrasive - DEB LIM2LT
Deb Solopol Lime LIM2LT Medium-Heavy Duty Hand Cleaner 2 Litre Cartridge
Deb Solopol Lime LIM2LT Medium-Heavy Gel Duty Hand Cleaner 2 Litre Cartridge