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Message: <blockquote data-quote="elwine30" data-source="post: 206392">Anxious, it's not magic science for your compression is low. The only way is to open engine and be prepared for some $$$.As for LCP's idea, it's a way to identify the source of the problem if it's piston ring, valve guide. Since your cooling system is alright, then it can be just the valve guide.Top overhaul on M50 not cheap or. Can you imagine how many valve guide required. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" />I had the same problem as yours and I did the top overhaul on my LA 332, E36 318i M40. It was the valve guide based on the oil test. Cost me about less 1K plus.</blockquote>