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Message: <blockquote data-quote="astroboy" data-source="post: 284194" data-attributes="member: 4527">I think many suffer the same and that's why sludge problem is so serious among the E46s, perhaps other UDM too.. During my shopping for E46 months ago.. I discover serious sludge problem in almost all E46 I inspected.Let me explain why. When I inspected a used car at the dealer, the dealer will voluntarily start up the engine and let the prospect listen to the engine. While I inspect the other part of the car for accidental damage bla..bla..bla.. the engine heats up. Body condition to me, is more important than engine because accidental car I confirm will avoid no matter how good is the engine.After about 10min, if I satisfy with body, I will move on to the engine. I will off the engine and now inspect the engine. I usually start with opening the oil cap and check for for sludge sign on the reverse side of the oil cap. When I open these E46's oil cap with a heated engine, you will see vapor gushing out like a cattle of boiling hot water. Some E46 are more serious then others. Now what is the chemical content of these vapor? H2O? I don't think so. Its obvious that these are oil vapor and with the cap closed, it will release into an oil catch if there is one, or commonly suck back into the intake manifold and burn along into exhaust during the combustion process.Mystery of vanishing engine oil... SOLVE!!!Next mystery, how come the exhaust remain dry? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes    :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /> There's an oil catch?</blockquote>

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