TransmissionQuestionCommunity Starter

2024 BMW i4 eDrive40 — should I service 'lifetime' transmission fluid?

TireTraveler65Community StarterJan 7, 20262024 BMW i4 eDrive40Los Angeles
2024 BMW i4 eDrive40, about 48,000 miles. Manual says the transmission fluid is lifetime under normal use, but the car is approaching 80k miles and I plan to keep it a long time. Curious what owners are actually doing and whether drain/fill versus exchange matters. I'd rather test this logically than start replacing parts.
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4 replies

TrailDetailerCommunity StarterCommunity StarterJan 8, 2026permalink
I'd want a measurement, not a hunch. Capture voltage while the 2024 BMW i4 is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. Have you gotten a second quote in writing? I'll poke at it this weekend.
WrenchRunnerCommunity StarterCommunity StarterJan 8, 2026permalink
This is usually cheaper to test than to guess. If a shop can't duplicate it on the 2024 BMW i4, bring a video plus freeze-frame data, not just a story. That's the branch I'd chase this week. Run the total, not the monthly, before you commit. That's my plan before I call anyone.
NorthTunerCommunity StarterCommunity StarterJan 8, 2026permalink
Start with the test that can prove you wrong. Write temp, speed, and in-gear vs coast when the 2024 BMW i4 does it — then decide on parts. That's the branch I'd chase this week. When does it actually happen? Not driving it hard until I know more.
DetailNerdCommunity StarterCommunity StarterJan 9, 2026permalink
I wouldn't throw parts yet. If a shop can't duplicate it on the 2024 BMW i4, bring a video plus freeze-frame data, not just a story. That's the branch I'd chase this week. Parts cannon is a personality type I try to avoid. I keep a notes app thread for this now.
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