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Message: <blockquote data-quote="Iceduke" data-source="post: 645710" data-attributes="member: 3721">whats the reason for changing piston rings? The N42/46 engines do tend to burn oil due to age but this is largely due to the bad valve seals from manufacture. Its not the piston rings <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> altho could be if the previous owner neglect change or abuse the engine till kingdom come. for GB can't comment la as most of us beemers tend to take advantage of the ultimate driving machine tag to the fullest haha...Well if you wanna change, there are many M54 2.5lit half cuts these days around mudah, but they range between 8-15k, but to convert from 2.0 to 2.5 it could cause you further headache as the wiring and competency of the mech doing it. So better do a thorough study before committing. You could be jumping from the pot to the fire.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>