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Changing Oil Brands Oddity ? #5234540 10/09/19 07:07 AM
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ChrisD46 Online Content OP
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In my last oil change I ran Valvoline Advanced 5W30 (no issues) before changing oil out to QSUD 5W20 ... Surprisingly , for the first couple of days the engine ran slightly rough and the gas mileage actually dropped before smoothing out and the gas mileage improved . Is there any truth to the belief that this happened as a result of the new oil needing a little time to remove the old add pack on metal surfaces before laying down it's own new add pack on metal surfaces and smoothing out ?


'17 Hyundai Sonata 2.4L GDI 5W20 QSUD / Fram Ultra
'10 Hyundai Elantra 2.0L 5W30 QSUD / Fram Ultra
'07 Kia Sedona 3.8L 5W30 M1 EP HM / Fram Ultra
Re: Changing Oil Brands Oddity ? [Re: ChrisD46] #5234550 10/09/19 07:16 AM
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Char Baby Online Content
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I've moved back & forth between the two grades just as you did. In fact, I've use the same oil brands & weights just as you did, going from one to the other in the same order you did. However if anything, I noticed a smoother/quieter engine with the QSUD.

Last edited by Char Baby; 10/09/19 07:17 AM.

"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Changing Oil Brands Oddity ? [Re: ChrisD46] #5234555 10/09/19 07:20 AM
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alarmguy Offline
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No truth, your engine roughness had nothing to do with the oil change/brands.


14 Road King (current)
08 VStar 1300 Tourer
07 Suzuki C50
Re: Changing Oil Brands Oddity ? [Re: ChrisD46] #5234561 10/09/19 07:27 AM
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buster Offline
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It's more likely that the gas you used had changed in some way. However, what you experienced has been noted before and could have something to do with the change in additive systems, although unlikely.


2019 Frontier Pro 4X - RGT 5w30
2019 Impreza Sport - OE fill
Re: Changing Oil Brands Oddity ? [Re: alarmguy] #5234620 10/09/19 08:24 AM
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ARCOgraphite Offline
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Originally Posted by alarmguy
No truth, your engine roughness had nothing to do with the oil change/brands.



Incorrect. Flat Earther ! smile

The add pack changeover effect has been discussed for decades.

I though my VW was going to blow up it ran so bad after an OC.
Going from a Ti DP oil to a different package had a similar
"engine is about to blow" effect.

It's that bad sometimes.

ChrisD46 you should have stuck with the Valvoline advanced. Best stuff out there right now in 5W30

Last edited by ARCOgraphite; 10/09/19 08:24 AM.

2019 VW Jetta S 6MT OCI#1 5885mi-Castrol Edge Prof? VW508+VW Service Filter; '17 Subaru Crosstrek CVT OC#7 52665mi-Castrol GTX Magnatec 5W20 + SOA Filter
Re: Changing Oil Brands Oddity ? [Re: ChrisD46] #5234653 10/09/19 08:48 AM
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oldhp Offline
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I highly doubt changing oil brands or weights had anything to do with engine running rough. If that was the case "almost every" car would go through this rough running engine phase.
I think gasoline or possibly MAP/MAF sensor got a piece of dirt on it.
On the very, very, very outside.........0001%, maybe, maybe going to "thinner" oil did not let 1 or more hydraulic lifter pump up for some reason.
Either that or car was mad mad about getting QSUD 5W20 and wanted it's Valvoline blood back, because Halloween is coming.................. shocked2


"None of us are getting out here alive.....drink that beer.....eat that pizza......drive that Hot Rod"
"When others cut you down, remember where they came from."
"I don't run...........I just wait"
Re: Changing Oil Brands Oddity ? [Re: ChrisD46] #5234656 10/09/19 08:51 AM
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JohnnyJohnson Offline
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I change weights and oil almost every OCI and its never been an issue in the 15 years + I've owned the Corolla.


2004 Corolla 136181
Out: EDGE EP 5W-30 Bosch 3311 7156 Miles
In: Havoline Pro DS 10w-30 Purolator PureOne 3-14-19 129693
2006 Duramax 76552
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: Changing Oil Brands Oddity ? [Re: JohnnyJohnson] #5234688 10/09/19 09:20 AM
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wemay Offline
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Originally Posted by JohnnyJohnson
I change weights and oil almost every OCI and its never been an issue in the 15 years + I've owned the Corolla.


Me too, never noticed any difference after the initial psychological effect of feeling smoother just 'cause new oil is in there.


2018 KIA Sportage LX 2.4 AWD
GTX Magnatec 5W20, Purolator L14459

2013 Hyundai Santa Fe Sport 2.0T
EDGE EP 5W30, FRAM PH9688
Re: Changing Oil Brands Oddity ? [Re: ChrisD46] #5234693 10/09/19 09:21 AM
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ARCOgraphite Offline
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I stand by my observations over 70 cars and 100's of oil changes.

I'm just a sensitive guy smile


2019 VW Jetta S 6MT OCI#1 5885mi-Castrol Edge Prof? VW508+VW Service Filter; '17 Subaru Crosstrek CVT OC#7 52665mi-Castrol GTX Magnatec 5W20 + SOA Filter
Re: Changing Oil Brands Oddity ? [Re: ARCOgraphite] #5234704 10/09/19 09:34 AM
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wemay Offline
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Originally Posted by ARCOgraphite
I stand by my observations over 70 cars and 100's of oil changes.

I'm just a sensitive guy smile


You may be right, i just never noticed...smile


2018 KIA Sportage LX 2.4 AWD
GTX Magnatec 5W20, Purolator L14459

2013 Hyundai Santa Fe Sport 2.0T
EDGE EP 5W30, FRAM PH9688
Re: Changing Oil Brands Oddity ? [Re: ChrisD46] #5234705 10/09/19 09:35 AM
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Fawteen Offline
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I've never seen any sort of change in the engine when changing oils.

I once had a headlight go out right after changing the oil though.


2014 Silverado
2014 Equinox
1972 Olds 442 Convertible
1918 Model T
Re: Changing Oil Brands Oddity ? [Re: ARCOgraphite] #5234709 10/09/19 09:39 AM
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buster Offline
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Originally Posted by ARCOgraphite
I stand by my observations over 70 cars and 100's of oil changes.

I'm just a sensitive guy smile


I believe you. With that many oil changes on many cars and being in tune with the engine, you're likely bound to hear some differences. There was once a member on here that used to work for XOM and he described it as "seating". Now, I'm sure this only happens in a smaller percentage of cases, but I can see it being totally legit. Especially if you're maybe changing from one oil with a very unique and different chemistry to another.


2019 Frontier Pro 4X - RGT 5w30
2019 Impreza Sport - OE fill
Re: Changing Oil Brands Oddity ? [Re: ChrisD46] #5234767 10/09/19 10:31 AM
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mclasser Offline
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I've noticed some oils make the engine quieter, but never experienced rough running from switching brands.


2018 Hyundai Elantra VE
2013 Honda Pilot EX-L 4WD
2002 Honda Accord EX-L

Re: Changing Oil Brands Oddity ? [Re: ChrisD46] #5234796 10/09/19 10:54 AM
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aquariuscsm Offline
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Maybe it’s because you went with a thinner oil? I’d go back to a W30.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Advanced Durability 10W30

Re: Changing Oil Brands Oddity ? [Re: ChrisD46] #5234884 10/09/19 12:44 PM
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Mad_Hatter Offline
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I change oil mfg all the time and sometimes even grade, albeit less often than I do change mfgs... and I've never noticed an appreciable difference in mpg's. What I do notice when it comes to mpg's is my occasional lead foot!πŸ˜‚

However, some lube brands do seem to produce more "noise" in my valve train for the first few hundred miles but it almost always settles down...I say "seems" because I have no real scientific way to substantiate that other than my calibrated ear and having sat behind the steering wheel for all 164k+ miles on my vehicle.πŸ˜‚

Last edited by Mad_Hatter; 10/09/19 12:45 PM.
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