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Potential minor contamination. How long to run before changing oil? #5143769 06/25/19 12:32 PM
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d00df00d Offline OP
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Wanted to see if there are some informed opinions on this.

I recently had my car's valve covers off for a couple of jobs. I intentionally did this near the end of an OCI so that draining the oil would take contaminants (residual silicone sealant, dust) with it. I've already driven around 150 miles since the job. Is that long enough to make sure as much of the contamination as possible has made its way into the oil and filter? I'm sure there'll be some traces floating around for the next OCI or two. I just want to make sure I'm getting out as much as possible on this drain.

Anyone have any evidence to suggest one way or another?


2008 BMW M3 Sedan 6MT
Re: Potential minor contamination. How long to run before changing oil? [Re: d00df00d] #5143770 06/25/19 12:34 PM
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Chris142 Offline
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Considering that most oil pumps pump gallons of oil a minute 150 miles is plenty.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
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Re: Potential minor contamination. How long to run before changing oil? [Re: Chris142] #5143771 06/25/19 12:35 PM
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d00df00d Offline OP
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Originally Posted by Chris142
Considering that most oil pumps pump gallons of oil a minute 150 miles is plenty.

Good point!


2008 BMW M3 Sedan 6MT
Re: Potential minor contamination. How long to run before changing oil? [Re: d00df00d] #5143827 06/25/19 01:45 PM
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bbhero Offline
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150 miles of short stop and go or highway run??
Type of oil filter?? Fram or M-1 etc etc??


Nissan Altima 3.5 Coupe
Cam2 Dexos1 Gen 2 5w30 Wix 57356 Oil filter
"Treat your family like your friends and treat your friends like your family."
Re: Potential minor contamination. How long to run before changing oil? [Re: d00df00d] #5143863 06/25/19 02:37 PM
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Bluestream Offline
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Better go a bit more to be safe...


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Re: Potential minor contamination. How long to run before changing oil? [Re: Bluestream] #5143866 06/25/19 02:41 PM
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d00df00d Offline OP
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Originally Posted by bbhero
150 miles of short stop and go or highway run??
Type of oil filter?? Fram or M-1 etc etc??

Mixed driving. Mahle filter.

Originally Posted by Bluestream
Better go a bit more to be safe...

Because?


2008 BMW M3 Sedan 6MT
Re: Potential minor contamination. How long to run before changing oil? [Re: d00df00d] #5143904 06/25/19 03:25 PM
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ka9mnx Offline
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10 minutes idling in the driveway would have done it.


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
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1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: Potential minor contamination. How long to run before changing oil? [Re: d00df00d] #5143912 06/25/19 03:35 PM
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Mad_Hatter Offline
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C'mon, farther...πŸ˜‚

[Linked Image]

(if you're concerned about "dust", are you using the absolute best filter at filtering particles down to "X" microns during the post valve cover job? I was recently reading that the most damaging particle size in an engine is in the 5~10 micron range as clearance between the piston ring and cylinder bore is typically 5 to 10 microns. See link below)

https://www.machinerylubrication.com/Read/30697/choose-oil-filter




Last edited by Mad_Hatter; 06/25/19 03:37 PM.
Re: Potential minor contamination. How long to run before changing oil? [Re: d00df00d] #5143930 06/25/19 03:58 PM
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Kestas Offline
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I dont believe anyone can say with any certainty how long it would take for all of the contaminants to get swept away in the oil.

Re: Potential minor contamination. How long to run before changing oil? [Re: Kestas] #5143937 06/25/19 04:05 PM
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d00df00d Offline OP
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Originally Posted by Kestas
I dont believe anyone can say with any certainty how long it would take for all of the contaminants to get swept away in the oil.

That's more or less what I suspected.

On UOAs (your own or others'), have you ever seen a spike in some reading from a one-time contamination event and then watched it tail off in subsequent UOAs? I made a meager effort to search for such a thing but I guess my Google-fu is weak.


2008 BMW M3 Sedan 6MT
Re: Potential minor contamination. How long to run before changing oil? [Re: Kestas] #5143938 06/25/19 04:05 PM
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Gebo Offline
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Originally Posted by Kestas
I dont believe anyone can say with any certainty how long it would take for all of the contaminants to get swept away in the oil.



+1 I believe you are most correct.


Now with my limited brain power, I would drain it now as I would think just draining the oil would get the majority of any particles out. I wouldn't wait anymore
for the oil filter to do its filtering on this batch of oil.


'98 LEX LS400 300K
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'07 Lex GX470 65K

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Re: Potential minor contamination. How long to run before changing oil? [Re: d00df00d] #5143948 06/25/19 04:19 PM
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Originally Posted by d00df00d
I made a meager effort to search for such a thing but I guess my Google-fu is weak.


πŸ˜‚, I like that.. stealing it!πŸ‘

Re: Potential minor contamination. How long to run before changing oil? [Re: d00df00d] #5144011 06/25/19 05:46 PM
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It won't do any good now, but FWIW, if I have to remove valve covers, I spray clean the motor (with Simple Green) and a handheld Quart or so pump sprayer on a COOL engine, rinse it with water in a garden sprayer, then run the engine until it's warm and dry, shut down again and blow the top off with Compressed air.
Much less to worry about dirt, grease, oil, dead bugs, etc., getting inside the valve covers if the OUTSIDE is already clean enough to eat off of before opening them. I would hope that all this sounds simply like common sense, which applies in your own garage, but not anyplace paid to do the work because they don't have time to care; besides, you'll never see the chunks they drop in YOUR engine.
I'm also BITOG OCD enough to always drain REALLY hot oil, after the engine is completely warm, and I use leather gloves over rubber gloves, long sleeves and have rags handy. Never been burned, I just sleep better draining my oil HOT, so I know whatever is suspended in the oil is still suspended when it's drained.

Re: Potential minor contamination. How long to run before changing oil? [Re: Ihatetochangeoil] #5144047 06/25/19 06:55 PM
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andyd Offline
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Cleaning the top of the engine bay before lifting the valve cover is probably a good idea. It would only add an extra hr to the job. Too OCD for this hack though grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Potential minor contamination. How long to run before changing oil? [Re: d00df00d] #5144063 06/25/19 07:13 PM
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bbhero Offline
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One thought about work being done and UOAs done afterwards...

Harryj had a head gasket done on his car....

Then had UOAs done afterwards. .

That may well be one to look at for trending UOAs after work was completed on a car.


Nissan Altima 3.5 Coupe
Cam2 Dexos1 Gen 2 5w30 Wix 57356 Oil filter
"Treat your family like your friends and treat your friends like your family."
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