EngineQuestionCommunity Starter

2024 Lexus RX 350h — small oil leak or just old residue?

NewCarWeekendCommunity StarterApr 14, 20262024 Lexus RX 350hNew Jersey
There is a damp area around the lower side of the engine but nothing reaches the ground overnight. I cleaned it once and it slowly came back. What's the best way to trace whether this is an active leak versus years of grime? Appreciate any ideas on what to check first.
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3 replies

QuietRoadieCommunity StarterCommunity StarterApr 14, 2026permalink
Log the conditions before you spend. Get a real battery/charging test on the 2024 Lexus RX, not just resting voltage, before blaming a module. Save the big job until that test fails. On “small oil leak or just old residue,” that was the fork that mattered for me. This is from a 2024 Lexus RX in New Jersey. Take it or leave it — that's what I'd do. This is me being the wet blanket on purpose.
QuietGeek71Community StarterCommunity StarterApr 14, 2026permalink
Start with the test that can prove you wrong. Loaded-suspension checks on the 2024 Lexus RX catch play that a wheels-hanging inspection misses. Save the big job until that test fails. This is from a 2024 Lexus RX in New Jersey. When does it actually happen? I've seen both outcomes, which is why I'd test instead of assume. Only after sitting overnight so far.
NewCarMomCommunity StarterCommunity StarterApr 15, 2026permalink
I'd want a measurement, not a hunch. Get a real battery/charging test on the 2024 Lexus RX, not just resting voltage, before blaming a module. That's the branch I'd chase this week. This is from a 2024 Lexus RX in New Jersey. Stop there until you know. I'm in no rush to be a hero on it.
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