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![why is my car telling me to change oil after oil change reddit why is my car telling me to change oil after oil change reddit](https://www.2carpros.com/images/question_images/297323/original.jpg)
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The oil filter elements are designed to collect as much of this detritus as possible without hindering free oil circulation through the engine (dirt = bad, low oil flow = worse bad). Then there are the normal by-products of an internal combustion engine: soot, metal wear particles, old oil residue breaking down, etc. Hopefully the differences with new brake pads and a new alternator are a bit easier to discern.įirst off, unless the engine is completely flushed, there will be some residual dirty oil still inside. It's still not conclusive if it comes cleaner, maybe you just flushed out the last of a heavy dose of residual sludge, but if it stays dark you may at least be able to trust your garage a bit more.
![why is my car telling me to change oil after oil change reddit why is my car telling me to change oil after oil change reddit](https://rustyautos.com/wp-content/uploads/2020/07/oil-filter-metal-300x178.jpg)
If you're super bothered, change it again yourself - catching what's in there already in a clean pan, so you can decant it into the soon-to-be-almost-empty bottle of new stuff, in case it turns out to be possibly reusable, and letting it drain out as long as you can stand (or until it stops, whichever is sooner - then flushing through a gulp of the new stuff, if the spec doesn't say to use the entire bottle) - and see if it remains nasty the second time. The higher mileage of yours may be a factor, but unless they did it very quickly without letting the sump fully drain, I'd have expected to see some change. Hmm, I've known oil to go black very quickly in older diesels, but not for it to be essentially instant.
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