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The BMW Range
3 Series
E90, E91, E92, E93
320I E90 Gear box oil change
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<blockquote data-quote="astroboy" data-source="post: 741840" data-attributes="member: 4527"><p>Heat exchange is to use radiator coolant to cool down oil. We have 2 heat exchangers.</p><p></p><p>1. coolant /engine oil</p><p>2. coolant/transmission oil</p><p></p><p>They look like this:</p><p><img src="https://c1552172.ssl.cf0.rackcdn.com/239032_x800.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>When they fail, they will allow coolant to mix with oil, hence compromise the oil's lubrication properties. Prolong use will damage engine or transmission depending which exchanger is compromised.</p><p></p><p>The only telltale is to visually inspect the oil for discoloring, oil mixed with water will form teh-tarik color. Engine oil we can inspect either by opening the filler cap or dipstick (some BMW models no dipstick). However, for transmission, there's is no dipstick. Therefore I have to clue how to check.</p><p></p><p>There's no recommended change interval for the heat exchanger. My e90 is 9 years old 120k km mileage, hasn't change any of the exchanger.</p><p></p><p>Some say coolant reservoir will see oil contamination when one of the exchanger fail. Some say no because coolant viscosity is lower than oil, hence oil won't get into coolant reservoir via the failed exchanger. I am not sure.</p></blockquote><p></p>
[QUOTE="astroboy, post: 741840, member: 4527"] Heat exchange is to use radiator coolant to cool down oil. We have 2 heat exchangers. 1. coolant /engine oil 2. coolant/transmission oil They look like this: [IMG]https://c1552172.ssl.cf0.rackcdn.com/239032_x800.jpg[/IMG] When they fail, they will allow coolant to mix with oil, hence compromise the oil's lubrication properties. Prolong use will damage engine or transmission depending which exchanger is compromised. The only telltale is to visually inspect the oil for discoloring, oil mixed with water will form teh-tarik color. Engine oil we can inspect either by opening the filler cap or dipstick (some BMW models no dipstick). However, for transmission, there's is no dipstick. Therefore I have to clue how to check. There's no recommended change interval for the heat exchanger. My e90 is 9 years old 120k km mileage, hasn't change any of the exchanger. Some say coolant reservoir will see oil contamination when one of the exchanger fail. Some say no because coolant viscosity is lower than oil, hence oil won't get into coolant reservoir via the failed exchanger. I am not sure. [/QUOTE]
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The BMW Range
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320I E90 Gear box oil change
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