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Message: <blockquote data-quote="mangkor" data-source="post: 306049" data-attributes="member: 14483">Dear Yellowmanta,If the theory regarding oil top up frequency is truly make sense, yes it is. Its sounds very unfair for the customer to spend more for top ups instead of the whole engine oil change.Based on my observations, most of the top-ups usually take not more than 3 times within the specified oil service intervals. Meaning the intervals between the top-ups is divided into sub 8,000km. We can conclude that the oil consumption rate is far far away from maximum permissible tolerance. In isolated cases, it is quite alarming that you need to top-up the engine oil so frequent.In this case, that’s why we need to conduct oil consumption test as described. By this way, we can certain that the high engine oil consumption is not due to worn out main engine components such piston rings, leaky valve stem seal and so on. If all test result does not lead to indication of defective engine parts, so we can narrow down to few other criteria that may cause the problem.One of the problem could be defective engine oil level sensor that giving inaccurate reading hence wrong info relayed to the receiver. Change the oil level sensor and problem solved and you’re happy ever after…In this subjective matter, we can certify that engine oil life is solely determined by the control units that continuously monitor the engine oil. The 25,000km oil service interval can be shorten (means it does not reach that point) accordingly to few factors such as the driving style, the weather and time frame. If you’re always drive the car fast like a racer, it will shorten the oil service life. If the car was driven in a very hot climate, it will reduce the service life too. And, the beauty part… the engine oil level sensor can also monitor the engine oil quality.It’s not really means if you top-up frequently, you have refreshed the engine oil quality so that it can last for specified oil service interval. The rational is, you cannot make a plain water clear if you pour it in a glass that already have a bit of milk or coffee.  Now days, BMW high tech engine has a better output – bigger horsepower and stronger torque in relative to the engine displacement. In contrary, this means the engine is working harder than normal engines. For M cars, for instead, they had a dream engine installed with hefty horsepower at incredible amount of torque. By design, these high power engine inherent a drawback of higher engine oil consumption. For comparison, I had a car which I change the engine oil on every 10,000km although the manufacturer says that the oil service interval should be at 7,000km if using a fully synthetic engine oil.The engine does not need oil to-up for the whole engine oil interval if I use the car for daily driving i.e. to work, weekend outings, jalan² cari makan and so on. BUT, if I drove the car for high speed in a long journey, I noticed the engine oil level decreased and need to top-up.And for comparison, if I’m using a Shell Helix Plus (semi synthetic), the oil consumption rate is stable (no need to top-up even for long haul high speed driving) . It just happened if I’m using a Castrol Magnatec (also a semi synthetic). Maybe thicker viscosity in Shell Helix (15W50) gives me better result than Castrol Magnatec (10W40). For then, I just stick to Shell Helix Plus till now…I hope your baby doesn’t need to have a heart transplant. The car should be in your hands where you happily can drive it everywhere you wanted, not lying in the workshop at this moment giving you headache and lost of hope and confident....I really hope for it…</blockquote>

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