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The BMW Range
3 Series
E90, E91, E92, E93
Oil contamination in Radiator expansion tank
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<blockquote data-quote="oligokoko" data-source="post: 413593" data-attributes="member: 14920"><p>this prob may due to :</p><p></p><p>a) ATF (transmission line) oil cooler leak</p><p>b) Engine oil cooler leak</p><p>c) Top gasket leak (may be detected by lost of compression in engine, under powered engine, vibration n misfiring engine)</p><p></p><p>but from my experience, the oil cooler usually leak. its either at the transmission line ot the engine oil line. the best way is to replace both oil coolers with d new 1. u may need to replace the engine oil cooler gasket as well. water will not enter the oil pan (either engine or transmission) if the leakage is a small 1. oil will usually enter the water lines due to oil is alot "thinner+ lighter" compared to water, so it can gp thru small leaks / openings. before its too late, i suggest u to</p><p></p><p>1) flush, reflush and do it all over again on the coolant system with a proper flushing detergent (n lots n lots of water) until u r confident that the sys is free / less of oil</p><p>2) replace engine oil and transmission oil cooler</p><p>3) replace gasket for engine oil cooler</p><p>4) just do a normal flushing (water only) and bleed d cooling sys (with coolant mixed) </p><p>5) use it for 2 weeks (frequent daily driving recommended, short to medium distance driving, average of 80-100kph vehicle speed) and bring it back to ur trusted SC / wshop</p><p>6) if the coolant line is still oily, i suggest to replace the cooling system as well (top n bottom hoses, engine connector, radiator, thermostat n water pump) - this will cost u sum bucks, pls be prepared</p><p>7) dun forget to ask the SC / wshop guys to check on engine oil n ATF condition as well</p><p></p><p>in really3 rare case, it might b a leakage in the power steering pump + water pump as well. encountered this once on a recond car. pls refer to the attachment for better explaination. the water pump is actually driven by power steering pump, which takes the rotational energy from the engine via power steering pump pulley. u can figure things out by looking at the picture. again, this is a very rare case but it does no harm to check whether it is ok or not. anyhow, please give us ur feedback after u have solved this problem.</p><p></p><p>Happy Troubleshooting !</p></blockquote><p></p>
[QUOTE="oligokoko, post: 413593, member: 14920"] this prob may due to : a) ATF (transmission line) oil cooler leak b) Engine oil cooler leak c) Top gasket leak (may be detected by lost of compression in engine, under powered engine, vibration n misfiring engine) but from my experience, the oil cooler usually leak. its either at the transmission line ot the engine oil line. the best way is to replace both oil coolers with d new 1. u may need to replace the engine oil cooler gasket as well. water will not enter the oil pan (either engine or transmission) if the leakage is a small 1. oil will usually enter the water lines due to oil is alot "thinner+ lighter" compared to water, so it can gp thru small leaks / openings. before its too late, i suggest u to 1) flush, reflush and do it all over again on the coolant system with a proper flushing detergent (n lots n lots of water) until u r confident that the sys is free / less of oil 2) replace engine oil and transmission oil cooler 3) replace gasket for engine oil cooler 4) just do a normal flushing (water only) and bleed d cooling sys (with coolant mixed) 5) use it for 2 weeks (frequent daily driving recommended, short to medium distance driving, average of 80-100kph vehicle speed) and bring it back to ur trusted SC / wshop 6) if the coolant line is still oily, i suggest to replace the cooling system as well (top n bottom hoses, engine connector, radiator, thermostat n water pump) - this will cost u sum bucks, pls be prepared 7) dun forget to ask the SC / wshop guys to check on engine oil n ATF condition as well in really3 rare case, it might b a leakage in the power steering pump + water pump as well. encountered this once on a recond car. pls refer to the attachment for better explaination. the water pump is actually driven by power steering pump, which takes the rotational energy from the engine via power steering pump pulley. u can figure things out by looking at the picture. again, this is a very rare case but it does no harm to check whether it is ok or not. anyhow, please give us ur feedback after u have solved this problem. Happy Troubleshooting ! [/QUOTE]
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E90, E91, E92, E93
Oil contamination in Radiator expansion tank
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