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Old 03-09-2021, 09:10 AM #16
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Sludge can be caused by other things as well not just type of oil. Long periods of idling in hot weather is what I think got me. I would make sure your PCV valve is new ($5) and also look at my post above about cleaning the OCV screens. Once I did those things I went to 5k OCI and its cleaned up. I'm at 215k+ miles now.
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Old 03-09-2021, 10:33 AM #17
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Thank you I will check those things out!


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Old 03-09-2021, 02:24 PM #18
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Quote:
Originally Posted by TFT4RL View Post
Iíve been using the the platinum synthetic from Walmart. Never had an issue with it before.
that's very good oil with a robust additive package, i strongly doubt that's where your problem is. Pennzoil had a PR disaster in the 80's with oil that was formulated wrong and sludged up badly...seems they're still living that episode down even today.

as Jivewalker said, overly extended change intervals for your uses along with poor PCV peformance and other minor factors like extended idling can contribute to oil varnishing in a way that might cause just enough sludge to affect a sensitive part like the oil control valves.
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Old 03-09-2021, 05:16 PM #19
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The OCVs have very tight fitment of the spool valve in the bore; a bit too much varnish can sometimes make them sticky and cause the DTC. Also an intermittently failing/weak coil can contribute to the issue, sometimes you might not notice a drivability issue.

Basically it doesn't have to be sludge in the sense of thick, chunky stuff; as MidniteTRD said, could be just a bit extra varnish on the valve and bore.

It's an issue that pops up every now and then on a lot of stuff.
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Old 03-10-2021, 10:23 AM #20
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Thanks for all the great info. I was thinking about it and I often do spend my lunch hour in my truck letting it idle. Maybe that caused an issue and had been building up over time. If it happens again I now know what to look for.


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