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The BMW Range
3 Series
E90, E91, E92, E93
Topping up engine oil on 325i
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<blockquote data-quote="t2ribena" data-source="post: 306045" data-attributes="member: 3847"><p>for loss of oil due to burning...</p><p></p><p>in normal engine operation it is normal that the engine oil residue left on the cylinder sleeve by the moving cylinder head liners got burnt during the combustion cycle...on the N52 engines a few factors could be causing this phenomenon to be more profound;</p><p></p><p>1. recommended engine oil viscosity is 5W-30 which is very 'thin' oil</p><p>2. Alusil cylinder sleeve and liners...this material basically 'absorbs' more oil to maintain a permanent oil layer on both surfaces...</p><p>3. very high operating temperature...</p><p></p><p>with the combination of the three condition above the engine oil burning is more significant than other engines...the hot operating temperature basically makes the oil more combustable since it is already so 'thin' and normally this would mean that the exhaust will emits white smoke...but this is only the case if the burning is not complete thus producing white fumes...but what if the 'thin' oil was burnt completely thus producing no white fumes...it can be the case...</p><p></p><p>i have also tried measuring the exhaust pipe temperature at the end pipe and it is about 160 degrees celcius (idling) which is really high...even there is a water vapour at this temperature i don't think we can see any indication at all on what is coming out from the exhaust....</p><p></p><p>so on those engines that consumes excessive engine oil this could be due to premature wear on the cylinder sleeve and liners that requires BMW to replace the crankcase and the cylinders...when this is the case both excessive engine loss to burning of the oil and thru vaporization is also possible...</p><p></p><p><u>disclaimer</u></p><p></p><p>based totally on my own 2 cents opinion... <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" /></p></blockquote><p></p>
[QUOTE="t2ribena, post: 306045, member: 3847"] for loss of oil due to burning... in normal engine operation it is normal that the engine oil residue left on the cylinder sleeve by the moving cylinder head liners got burnt during the combustion cycle...on the N52 engines a few factors could be causing this phenomenon to be more profound; 1. recommended engine oil viscosity is 5W-30 which is very 'thin' oil 2. Alusil cylinder sleeve and liners...this material basically 'absorbs' more oil to maintain a permanent oil layer on both surfaces... 3. very high operating temperature... with the combination of the three condition above the engine oil burning is more significant than other engines...the hot operating temperature basically makes the oil more combustable since it is already so 'thin' and normally this would mean that the exhaust will emits white smoke...but this is only the case if the burning is not complete thus producing white fumes...but what if the 'thin' oil was burnt completely thus producing no white fumes...it can be the case... i have also tried measuring the exhaust pipe temperature at the end pipe and it is about 160 degrees celcius (idling) which is really high...even there is a water vapour at this temperature i don't think we can see any indication at all on what is coming out from the exhaust.... so on those engines that consumes excessive engine oil this could be due to premature wear on the cylinder sleeve and liners that requires BMW to replace the crankcase and the cylinders...when this is the case both excessive engine loss to burning of the oil and thru vaporization is also possible... [U]disclaimer[/U] based totally on my own 2 cents opinion... :P [/QUOTE]
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Topping up engine oil on 325i
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