Assembly

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Post-purchase service to engine & transmission
Preventative maintenance to replace fluids and other consumables in the b46 engine and automatic transmission to ensure everything is healthy. Inspected air filter and found it was clean. Changed engine oil and filter with 5w30. Replaced spark plugs with OEM NGK. Flushed transmission twice with new OEM fluid.
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Plan
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Parts
Decisions & Unknowns
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What oil is best for B46? 5W-30
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What ATF? BMW ATF 6
Tasks
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Make a parts list based on research
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Trans fluid
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Engine oil & filter
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Engine air filter (looked fresh; leave for now)
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Spark plugs