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Message: <blockquote data-quote="McFir7" data-source="post: 186960" data-attributes="member: 3200">get the overhaul kit n let him do it..i got to overhaul too man..mine is same model n 5 years old...the culprit to this engine is slude. that jam the piston ring to move freely n cause worn out.. why this happen?is because most of us did our service out of ab.in ab the practice to drain all out the old engine oil then use a full 4 litre engine flush to clean the engine b4 putting the new engine oil.. whereas in local workshop they normally used the top-up engine flush to the old oil b4 putting in the new engine oil...this was the mistake.. due to the engine running on really hot tempreture compare to other bimmer engine..towards the end of the oil change interval..some amount of the engine oil will be sludge.so as this accumulate as we didnt use the full 4 litre flush oil,will jam those lord of the rings(piston rings) so these where we end my friend...</blockquote>