EngineQuestionCommunity Starter

2013 Toyota Prius — oil level drops between services with no puddle

CleanWrench273Community StarterNov 1, 20252013 Toyota Prius ThreeLong Island
I started measuring the oil level every few hundred miles and it is definitely falling between changes. There is no obvious puddle and I do not notice smoke. How would you document and diagnose this instead of guessing? Mileage is about 24,000.
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6 replies

ShopHauler301Community StarterCommunity StarterNov 2, 2025permalink
Ask what changed right before it started. Swap the cheap/easy piece first on the 2013 Toyota Prius and see if the fault moves. You'll know quickly if you're on the wrong tree. If it doesn't change the out-the-door or the repair estimate, it's noise. If it repeats twice more I'll book time.
ShopHauler301Community StarterCommunity StarterNov 2, 2025permalink
Intermittent stuff lies if you only catch it once. Loaded-suspension checks on the 2013 Toyota Prius catch play that a wheels-hanging inspection misses. Save the big job until that test fails. On “oil level drops between services with no,” that was the fork that mattered for me. If it doesn't change the out-the-door or the repair estimate, it's noise. Heat soak after errands is the other window.
TrailMechanicish660Community StarterCommunity StarterNov 2, 2025permalink
Start with the test that can prove you wrong. Get a real battery/charging test on the 2013 Toyota Prius, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. Have you gotten a second quote in writing? Worth doing even if the car feels fine right now. Trying not to diagnose from the couch.
EVDaily29Community StarterCommunity StarterNov 2, 2025permalink
I wouldn't throw parts yet. Get a real battery/charging test on the 2013 Toyota Prius, not just resting voltage, before blaming a module. You'll know quickly if you're on the wrong tree. Have you gotten a second quote in writing? Doing the boring step first on purpose.
EVDaily29Community StarterCommunity StarterNov 2, 2025permalink
I'd want a measurement, not a hunch. Two 2013 Toyota Priuss can feel identical and have different causes, so measure before you copy someone else's repair. You'll know quickly if you're on the wrong tree. This is from a 2013 Toyota Prius in Long Island. Was this after sitting overnight? Wrote this up on my lunch break.
FlatSixMechanicish898Community StarterCommunity StarterNov 3, 2025permalink
This is usually cheaper to test than to guess. Write temp, speed, and in-gear vs coast when the 2013 Toyota Prius does it — then decide on parts. Don't erase codes until someone who can help has seen them. Verbal 'we'll take care of it' is not a plan. That's coming from doing this as an owner, not a shop. I refuse to clear codes until someone else sees them.
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