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QSUD and cleaning? #5246800 10/22/19 07:56 AM
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irv Offline OP
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I just purchased a 5 Lt jug of 5W-30 for my son's girlfriends car (2005 3.5 L Malibu with 74,000 kms) because it was on sale. The car, surprisingly, only takes 4 Lts but what I am curious about is the cleaning properties of this oil?

Is it just as good as others or is it known not to be as good? I did a small bit of reading after the fact but didn't see anything mentioned about its cleaning capabilities?

I would assume some oils are better than others in this dept, but has any of it ever been proven beyond a reasonable doubt?


2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
Pennzoil Platinum and/or Pennzoil Ultra Platinum in all 3.
Re: QSUD and cleaning? [Re: irv] #5246808 10/22/19 08:04 AM
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CT8 Offline
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No better than other oils with similar base oils and additive packages.

Re: QSUD and cleaning? [Re: irv] #5246826 10/22/19 08:17 AM
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ARCOgraphite Offline
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Whats the service category and ILSAC rating? that gives you minimum requirements.

I found it to be fair to good in the pre GTL form and Valvoline superior in Subaru.
I'm sure it will be fine.

Why are you thinking about this especially in low performance engines?


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: QSUD and cleaning? [Re: irv] #5246829 10/22/19 08:22 AM
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It will perform well. Our 10’ escape has used QSUD 5w20 since 120k miles @ 5-7k intervals and it is very clean under the valve cover.

I can’t say if it’s better or worse than M1 or PP/PUP. I can say in an already moderately clean engine (our escape previously was dealer serviced every 5k up to 120k) it will keep the engine clean and do some light cleaning.

Rather or not it will clean a “dirty” engine I’m unsure about. If I had to guess I would say given a reasonable interval it would do some cleaning since QSUD has a decent additive package.


Last edited by donnyj08; 10/22/19 08:23 AM.

2008 Silverado Z71 LT 99k PP 10w30 SN+
2010 Ford Escape 199k QSUD 5w20
2016 Tucson Limited 1.6T AWD 27K A5/B5 5w30
2016 Yamaha XSR900 13k, Spectro 10w40, Yamaha Filter.
Re: QSUD and cleaning? [Re: ARCOgraphite] #5246837 10/22/19 08:30 AM
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irv Offline OP
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Originally Posted by ARCOgraphite
Whats the service category and ILSAC rating? that gives you minimum requirements.

I found it to be fair to good in the pre GTL form and Valvoline superior in Subaru.
I'm sure it will be fine.

Why are you thinking about this especially in low performance engines?


When I did an oil/filter change the other day, judging by the looks of the oil pan drain bolt and the "Luber Finer" filter that was on it, I assumed this car hadn't had too many oil changes done?
The drain plug was rusty and it was difficult getting a 13 mm wrench on it. The filter didn't look like it had been changed in quite sometime either and was a royal pia removing it. I needed a strap wrench to loosen it and I've never heard of a "Luber Finer" filter before.

So, with all that being said, I assume the internal engine components aren't likely in the best/cleanest condition they can be?

I'll be running this oil until spring so it doesn't matter much now, but I just was curious if there was any info out there on how good this oil cleaned or didn't clean?


2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
Pennzoil Platinum and/or Pennzoil Ultra Platinum in all 3.
Re: QSUD and cleaning? [Re: irv] #5246895 10/22/19 09:16 AM
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2013 Cadillac XTS4 3.6
2015 Dodge Durango Limited 3.6
Re: QSUD and cleaning? [Re: irv] #5247031 10/22/19 11:49 AM
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benjy Offline
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oils with the same SPECS are VERY similar by law except the costly real synthetic PAO + Ester types

Re: QSUD and cleaning? [Re: benjy] #5247033 10/22/19 11:50 AM
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kschachn Online Content
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Originally Posted by benjy
oils with the same SPECS are VERY similar by law except the costly real synthetic PAO + Ester types

By law?


1994 BMW 530i, 250K
1996 Honda Accord, 280K
1999 Toyota Sienna, 425K
2000 Toyota ECHO, 284K
Re: QSUD and cleaning? [Re: irv] #5247048 10/22/19 12:12 PM
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jbutch Offline
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Here is an under valve cover picture from one of my earlier posts.

Engine was Suzuki SX4 and I used QSUD all it's life (230k km). It was the previous QSUD version (brown/gold bottle) though. OCI was every 8k km (5k miles)

Some varnish but no sludge.

Last edited by jbutch; 10/22/19 12:13 PM.

2015 Forester XT @ 100k km
Current fill: Rotella T6 Multi Vehicle 5w-30 with Fram Ultra XG7317
Re: QSUD and cleaning? [Re: jbutch] #5247060 10/22/19 12:21 PM
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pbm Offline
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Originally Posted by jbutch
Here is an under valve cover picture from one of my earlier posts.

Engine was Suzuki SX4 and I used QSUD all it's life (230k km). It was the previous QSUD version (brown/gold bottle) though. OCI was every 8k km (5k miles)

Some varnish but no sludge.



I would have expected less varnish using a name brand synthetic (QSUD) every 5K....I've seen engines ran 10K OCIs on Mobil 1 (Tig 1's come to mind) with virtually no varnish..


'Journalism is Dead'
Re: QSUD and cleaning? [Re: irv] #5247278 10/22/19 03:39 PM
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*Curious if a faulty or old PCV valve could contribute to the varnish ? ... You would think a 5K mile OCI with oil filter change using QSUD the engine would be cleaner ?
Today's QSUD is D1 /Gen 2 rated , so I would think an even better cleaning formula than the prior brown jug QSUD ?


'17 Hyundai Sonata 2.4L GDI 5W20 QSUD / Fram Ultra #9688
'10 Hyundai Elantra 2.0L 5W30 (50%) / 5W20 (50%) QSUD / Fram Ultra #9688
'07 Kia Sedona 3.8L 5W30 Castrol EP / Fram Ultra #9999
Re: QSUD and cleaning? [Re: irv] #5247281 10/22/19 03:42 PM
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buster Offline
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What you could do is switch to an oil that is above average at cleaning and for that I would use Mobil 1 0w40. I'd do a few OCI's on that then switch to whatever oil you want.

https://www.mobil.com/English-US/Passenger-Vehicle-Lube/pds/GLXXMobil-1-FS-0W40

"Provides exceptional cleaning power for dirty engines."


2019 Frontier Pro 4X - RGT 5w30
2019 Impreza Sport - OE fill
Re: QSUD and cleaning? [Re: pbm] #5247286 10/22/19 03:46 PM
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Originally Posted by pbm
Originally Posted by jbutch
Here is an under valve cover picture from one of my earlier posts.

Engine was Suzuki SX4 and I used QSUD all it's life (230k km). It was the previous QSUD version (brown/gold bottle) though. OCI was every 8k km (5k miles)

Some varnish but no sludge.



I would have expected less varnish using a name brand synthetic (QSUD) every 5K....I've seen engines ran 10K OCIs on Mobil 1 (Tig 1's come to mind) with virtually no varnish..

I could be wrong on this one but there's really no way to predict when, where and how varnish will lay down and that what's going on inside of the engine and the oci has more to do with varnish formation than the lube itself. That said, some oils like a PAO have better solvency than others but I don't believe that's any guarantee you're not going to see any varnish.

Last edited by Mad_Hatter; 10/22/19 03:48 PM.
Re: QSUD and cleaning? [Re: ChrisD46] #5247292 10/22/19 03:51 PM
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Originally Posted by ChrisD46
*Curious if a faulty or old PCV valve could contribute to the varnish ? ... You would think a 5K mile OCI with oil filter change using QSUD the engine would be cleaner ?
Today's QSUD is D1 /Gen 2 rated , so I would think an even better cleaning formula than the prior brown jug QSUD ?

A faulty pcv valve can back up oil laden crankcase gasses..an example is if you you took off the non pcv side valve cover, it's likely you'd see more varnish on that one than you'd find under the VC on the PCV side.

Last edited by Mad_Hatter; 10/22/19 03:54 PM.
Re: QSUD and cleaning? [Re: irv] #5247313 10/22/19 04:20 PM
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aquariuscsm Offline
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I think it’s engine dependent. I’ve seen varnished up engines that ran M1 exclusively,and engines so clean you could literally eat off of them that were run only on dino.


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

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