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The BMW Range
3 Series
E46
E46 Transmission Fluid
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<blockquote data-quote="funfer_fahrer" data-source="post: 161530" data-attributes="member: 2733"><p><span style="font-size: 15px"><span style="font-size: 10px">I hope this write up would clear our doubts. After extensive research regarding this matter, this is what I found:</span></span></p><p style="text-align: left"></p> <p style="text-align: left"><strong><u>Transmission Hydraulics</u></strong></p><p><span style="font-family: 'HelveticaNeue-Bold'"><p style="text-align: left"></p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Bold'"><strong>Transmission Fluid (Oil)</strong></p><p></span><span style="font-family: 'HelveticaNeue-Light'"><p style="text-align: left"></p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">The automatic transmission provides pressure regulated hydraulic fluid which is filtered for all of the transmissions functional requirements. All BMW automatic transmissions are designed to operate with specific fluids. Use of non-approved oil will cause malfunctions and irreparable transmission damage which is not covered by BMW warranty.</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'"></p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">The transmission fluid provides the following functions:</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">• Lubricates mechanical components (planetary gears, bearings etc.).</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">• Removes heat and transfers heat to transmission cooling system. (Heat Exchanger).</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">• Removes debris and contaminants to sump and filter when circulated.</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">• Provides a transfer of kinetic energy in the torque converter.</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">• Allows hydraulic operation of mechanical components (clutches, brakes) via control of the valve body.</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">Also, transmission fluid has various properties to prevent oxidation and breakdown from heat and friction. Each type of transmission fluid has properties specific for each transmission application.</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">Fluid level is crucial in the proper operation of an automatic transmission. Improper fluid levels will cause improper operation and eventually irreparable transmission damage.</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'"></p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">Improper fluid level can cause:</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">• A low fluid level can cause an interruption in oil flow during fast acceleration or hard braking which can cause gear shift malfunctions.</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">• An excessively high fluid level can cause the rotating mechanical components to</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">paddle in the oil. This produces foam which introduces air into the hydraulic</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">system.</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'">• A low fluid level can also cause transmission overheating causing premature transmission failure.</p></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'"></p><p><span style="font-family: 'HelveticaNeue-Bold'"><span style="font-size: 15px"><p style="text-align: left"><strong>Transmission Fluid Application</strong></p><p></span></span><span style="font-family: 'HelveticaNeue-Light'"><p style="text-align: left"></p></span></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'"><span style="font-family: 'HelveticaNeue-Light'">There are numerous types of transmission fluid used in BMW transmissions. With the exception of the early transmissions (4HP22/24, A4S310/270R and the A5S310Z) <strong>all current BMW transmissions use “Lifetime Fill” transmission fluid. There is no maintenance required for these transmissions</strong>. It is important to use the correct fluid. Incorrect use of the transmission fluid can cause non warrantable transmission damage.</p></span></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'"><span style="font-family: 'HelveticaNeue-Light'"></p></span></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'"><span style="font-family: 'HelveticaNeue-Light'">When <strong>performing repairs on transmissions with lifetime fluid, it is important to drain the transmission fluid</strong> in to a clean container for re-use. <strong>New fluid should only be used for transmission replacement and for topping off after repairs.</strong></p></span></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'"><span style="font-family: 'HelveticaNeue-Light'">Also, transmission fluid level is vital to the proper operation of the transmission. Refer to BMW Service Bulletin B 24 01 98 for proper fluid level checking procedures.</p></span></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'"><span style="font-family: 'HelveticaNeue-Light'">When servicing or repairing BMW automatic transmissions, refer to TIS for fluid capacities.</p></span></span></p><p style="text-align: left"><span style="font-family: 'HelveticaNeue-Light'"><span style="font-family: 'HelveticaNeue-Light'">For fluid types refer to the “Operating Fluids Manual”.</p><p></span></span></p></blockquote><p></p>
[QUOTE="funfer_fahrer, post: 161530, member: 2733"] [SIZE=4][SIZE=2]I hope this write up would clear our doubts. After extensive research regarding this matter, this is what I found:[/SIZE][/SIZE] [LEFT] [B][U]Transmission Hydraulics[/U][/B][/LEFT] [FONT=HelveticaNeue-Bold][LEFT] [B]Transmission Fluid (Oil)[/B][/LEFT] [/FONT][FONT=HelveticaNeue-Light][LEFT] The automatic transmission provides pressure regulated hydraulic fluid which is filtered for all of the transmissions functional requirements. All BMW automatic transmissions are designed to operate with specific fluids. Use of non-approved oil will cause malfunctions and irreparable transmission damage which is not covered by BMW warranty. The transmission fluid provides the following functions: • Lubricates mechanical components (planetary gears, bearings etc.). • Removes heat and transfers heat to transmission cooling system. (Heat Exchanger). • Removes debris and contaminants to sump and filter when circulated. • Provides a transfer of kinetic energy in the torque converter. • Allows hydraulic operation of mechanical components (clutches, brakes) via control of the valve body. Also, transmission fluid has various properties to prevent oxidation and breakdown from heat and friction. Each type of transmission fluid has properties specific for each transmission application. Fluid level is crucial in the proper operation of an automatic transmission. Improper fluid levels will cause improper operation and eventually irreparable transmission damage. Improper fluid level can cause: • A low fluid level can cause an interruption in oil flow during fast acceleration or hard braking which can cause gear shift malfunctions. • An excessively high fluid level can cause the rotating mechanical components to paddle in the oil. This produces foam which introduces air into the hydraulic system. • A low fluid level can also cause transmission overheating causing premature transmission failure. [/LEFT] [FONT=HelveticaNeue-Bold][SIZE=4][LEFT][B]Transmission Fluid Application[/B][/LEFT] [/SIZE][/FONT][FONT=HelveticaNeue-Light][LEFT] There are numerous types of transmission fluid used in BMW transmissions. With the exception of the early transmissions (4HP22/24, A4S310/270R and the A5S310Z) [B]all current BMW transmissions use “Lifetime Fill” transmission fluid. There is no maintenance required for these transmissions[/B]. It is important to use the correct fluid. Incorrect use of the transmission fluid can cause non warrantable transmission damage. When [B]performing repairs on transmissions with lifetime fluid, it is important to drain the transmission fluid[/B] in to a clean container for re-use. [B]New fluid should only be used for transmission replacement and for topping off after repairs.[/B] Also, transmission fluid level is vital to the proper operation of the transmission. Refer to BMW Service Bulletin B 24 01 98 for proper fluid level checking procedures. When servicing or repairing BMW automatic transmissions, refer to TIS for fluid capacities. For fluid types refer to the “Operating Fluids Manual”.[/LEFT] [/FONT][/FONT] [/QUOTE]
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