Engine oil gets dirty quick - Kia Forum

 
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post #1 of 7 (permalink) Old 07-07-2019, 08:13 PM Thread Starter
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Engine oil gets dirty quick

I've found the gamma engine, at least on my car, the oil tends to darken much quicker than other cars I've owned. Last time, I ran full synthetic 5w20 about 7500km with marvel mystery oil. I usually run 5w20 regular, and I find even at around 1000km or less the oil turns dark. When I opened the filler cap, it seems whistle clean. All maintenance records from previous owners were provided.

Is it normal on this car? Can I extend oil change intervals using full synthetic oil? Last time I was gonna go 12k on full synthetic, i usually run 7-8k on conventional.

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post #2 of 7 (permalink) Old 07-07-2019, 10:14 PM
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It depends on the oil, some oils do better cleaning job of engine internals and absorb the carbon thus get darker sooner, that's not a bad thing.
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post #3 of 7 (permalink) Old 07-08-2019, 06:59 AM
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For oil change intervals I would never go over the maximum interval that the manufacture recommends.
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post #4 of 7 (permalink) Old 07-08-2019, 07:32 AM
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Quote:
Originally Posted by xdarkxfirex View Post
I've found the gamma engine, at least on my car, the oil tends to darken much quicker than other cars I've owned. Last time, I ran full synthetic 5w20 about 7500km with marvel mystery oil. I usually run 5w20 regular, and I find even at around 1000km or less the oil turns dark. When I opened the filler cap, it seems whistle clean. All maintenance records from previous owners were provided.

Is it normal on this car? Can I extend oil change intervals using full synthetic oil? Last time I was gonna go 12k on full synthetic, i usually run 7-8k on conventional.
Why do you feel the need to use the snake oil?

You changed oils to one that has a higher detergent content, and the snake oil, which is most likely why the oil is appearing darker quicker - if you continue using the detergent oil it will most likely clean up after two or three cycles.

Quality and not quantity counts.

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post #5 of 7 (permalink) Old 07-08-2019, 08:43 AM
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And you can extend the intervals to 12k. I have been using full synthetic and 7500 mile intervals for oil changes since our was new with no additive.

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post #6 of 7 (permalink) Old 07-10-2019, 09:05 PM
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I have noticed the oil in our Rio definitely darkens considerably quicker than the other cars I maintain. The oil in the Rio will be darker after 2000 miles than the oil in my Ram or Toyota with 8000 miles on the oil. Been this way since new.
When the Rio was doing a lot of shorter trips (under 10 miles) the oil would blacken like oil in a Diesel engine very quickly. Now that the Rio is driven a lot and more aggressively, the oil doesn’t darken near as bad.
Doesn’t seem to make a difference if I use conventional or synthetic, 5w20 or 5w30. I stick with 5000 OCI.
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post #7 of 7 (permalink) Old Today, 11:20 AM
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This is normal, It's a symptom of the GDI engines. I'm at 120,000 miles and the oil has always been dark relatively quickly. I keep my intervals at 4000 miles but I track my car frequently.
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