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Disturbing experience changing my oil.

S550_Newbie

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So I changed out my oil in my Silverado 1500 today and last time I changed it I switched to 0w-20 Royal Purple with a K&N oil filter (it was all they had at the time). Well before I changed the oil today I had started smelling a terrible exhaust smell that I thought was odd. During the oil change as soon as I started dumping the old oil the smell hit me, very burnt oil. I was not happy. This time I used Pennzoil Platinum with a Wix XP, drove the truck, no more smell and the engine is idling very smooth and the oil pressures seem much more stable.

Its almost as though the oil wasn't circulating in the engine, bad oil filter?

Any thoughts are appreciated or has anyone experienced this? I noticed I had full power back to the engine which I never realized I lost since the Royal Purple oil change. The truck is a 2018 with 18K miles but I drove it for 5K miles before the oil change today. WTF!
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Y'all came to a Mustang forum, posted in the Mustang section, and are surprised we don't want to talk about your truck? A Chevy no less? The nerve of some people :cwl:
Pretend it was my 'stang, the vehicle is irrelevant. :0
 

silverbullet85

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I don't see how what kind of oil you have in the engine could possible have anything to do with a bad exhaust smell. Sounds like you have a leak somewhere
 

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I don't see how what kind of oil you have in the engine could possible have anything to do with a bad exhaust smell. Sounds like you have a leak somewhere
I don't think it had anything to do with the oil, I suspect a bad filter restricting flow. Now I am left wondering what damage that cooked oil caused. The exhaust smell was that of burnt oil, could be a leak somewhere.
 

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Maybe take-apart the K&N filter to see if anything obvious is wrong with it? I think some K&N oil filters have some check valves in them. Perhaps it was stuck closed? But there may also be some sort of a bypass valve when the filter is clogged/blocked.
 

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But looking at the cross-section of the k&n, that recirculation valve that they have in them shouldn't have blocked the filter flow even if the valve was stuck closed. Now if it was stuck open for some reason, you'd basically be bypassing the filtering element.
 
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Maybe take-apart the K&N filter to see if anything obvious is wrong with it? I think some K&N oil filters have some check valves in them. Perhaps it was stuck closed? But there may also be some sort of a bypass valve when the filter is clogged/blocked.
Good idea, time to break out the dremel. I have never smelled oil that burnt before, it was nauseating. After the change though, no exhaust smell and very smooth, hopefully I caught a break and no internal damage other than some carbon build up.
 

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If the oil wasn't circulating, you would have had much worse problems than a funny smell. There isn't much you can do to an engine with an oil change as long as it has oil and it comes up to a pressure that doesn't trip the light/clatter all of the lifters.
 

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But looking at the cross-section of the k&n, that recirculation valve that they have in them shouldn't have blocked the filter flow even if the valve was stuck closed. Now if it was stuck open for some reason, you'd basically be bypassing the filtering element.
I inspected the oil carefully, no metal shavings or anything other than black liquid.
 
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If the oil wasn't circulating, you would have had much worse problems than a funny smell. There isn't much you can do to an engine with an oil change as long as it has oil and it comes up to a pressure that doesn't trip the light/clatter all of the lifters.
Good point, no lights or indicators during those 5K miles.
 

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Hello; Well since I also have a Silverado currently I will follow the thread. Not sure of the answer but have some guesses.
First guess is the oil must have been doing it's job or you would not have been able to drive 5000 miles on it. May be too late or not worth the expense but an oil analysis might answer some questions.
Second guess is perhaps that oil has additives which make it smell different. I have never used it so cannot say.
Third guess is the truck should have a by-pass valve to allow oil to flow if the filter gets stopped. Hope this is correct as my Silverado should have one.
Fourth guess is had there been oil starvation or lack of lubrication you would; hear the valve train letting you know.

Let us hope my second guess is the one closest to correct. I see the oil on shelves and have not been tempted to use it due to premium price. May have more zinc or other additives.

I wound up with a Silverado back in 2004 due to a totaled F-150 and the need to move to a new pickup. Ford had just done a big remodel on the F-150 and were not making deals.
I also was taken back by the height of the pickup beds sides. I could not reach in and touch the floor from the side. That particular trend had endured for some reason.
My 2004 Silverado has held up better than expected for almost 17 years. It only has a bit over 60,000 miles on it tho.

Good luck
 

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I've had bad service from RP. If you gave it to me I would not use it.
 
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Hello; Well since I also have a Silverado currently I will follow the thread. Not sure of the answer but have some guesses.
First guess is the oil must have been doing it's job or you would not have been able to drive 5000 miles on it. May be too late or not worth the expense but an oil analysis might answer some questions.
Second guess is perhaps that oil has additives which make it smell different. I have never used it so cannot say.
Third guess is the truck should have a by-pass valve to allow oil to flow if the filter gets stopped. Hope this is correct as my Silverado should have one.
Fourth guess is had there been oil starvation or lack of lubrication you would; hear the valve train letting you know.

Let us hope my second guess is the one closest to correct. I see the oil on shelves and have not been tempted to use it due to premium price. May have more zinc or other additives.

I wound up with a Silverado back in 2004 due to a totaled F-150 and the need to move to a new pickup. Ford had just done a big remodel on the F-150 and were not making deals.
I also was taken back by the height of the pickup beds sides. I could not reach in and touch the floor from the side. That particular trend had endured for some reason.
My 2004 Silverado has held up better than expected for almost 17 years. It only has a bit over 60,000 miles on it tho.

Good luck
Thanks, nice. I got a deal I couldn't refuse on this 2018, it was done up by 3rd Century Conversions for Chevy, sticker was 68K but since I bought it in fall of 2019, they dropped it to 47K and I traded my old truck in for it. So I got a 68K truck with 100 miles on it for 21K. Never had a Chevy truck until now, had 2 Ford F-150's though.
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