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Is fuel dilution taken into account when they recommend xw-20? #5217463 09/19/19 09:34 PM
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Whammo Offline OP
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I have heard quite a few people say to run a higher weighted oil than is printed on the oil cap due to fuel dilution on GDI cars (so 5w30 instead of 5w20). When the manufacturers select the oil to be recommended on the oil cap, do they take into account fuel dilution that will likely occur?

Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Whammo] #5217471 09/19/19 09:41 PM
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slacktide_bitog Online Content
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Honda sure doesn't cry

They say to use 0w20 in a turbo (their 1.5T). Oh, and regular gas, too! LOL
(87 octane US, 91 RON)

Much less of a problem with 5w30 and premium

Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Whammo] #5217515 09/19/19 11:43 PM
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geeman789 Offline
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And, change the oil every 3000 miles ...


Our Honda Pilot gets short tripped in cold winter temperatures, the EXACT scenario giving Honda, and I would assume other manufacturers, grief. The oil turns very dark very quickly, and smells strongly of gas. Plus, a little goo on the oil fill cap. In the summer, none of this happens ...

I do an extra oil change in the winter, and use a 30 grade oil.

Just like the old days !


2011 SUBARU Impreza 5-door manual / 2016 HONDA Pilot / 2011 MAZDA 2 auto
Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Whammo] #5217517 09/19/19 11:58 PM
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Mad_Hatter Offline
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If they do, good luck getting them to admit it... think about it.

I can see the commercial now...

"The new 2020 Accord, featuring less fuel sneaking past the oil rings and contaminating the oil, than our 2019 model Accord"๐Ÿ˜‚


Ok, all joking aside..I don't think you would ever uncover official internal corporate engineer's notes saying "minimum Xw30 needed for fuel dilution"... that could explode into a yuuuuge class action suit, potentially.

Last edited by Mad_Hatter; 09/19/19 11:58 PM.
Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Whammo] #5217536 09/20/19 12:58 AM
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OilUzer Offline
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I think oxidation may eventually cancel out and even take over dilution ...
That's why Seq IIIH test allows up to %150 viscosity increase ... I'm guessing, maybe experts can correct me. It may take much longer than most people wait to get there though!

The maximum allowable viscosity increase is:
%150 IIIH SN/SN Plus/GF-5
%100 GF-6

Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Whammo] #5217537 09/20/19 01:05 AM
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Hyundai/Kia allow the use of 5W20 , 5W30 and 10W30 based on ambient temps the owner expects to use the vehicle during the OCI ... My 2.4L GDI engine oil smells strongly of gas by the 3K mile mark ,so I go up a grade over a 3,750 mile OCI using a 5W30 D1/G2 rated synthetic just to have some head room in case of fuel dilution .


'17 Hyundai Sonata 2.4L GDI 5W30 PUP / 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: Is fuel dilution taken into account when they recommend xw-20? [Re: ChrisD46] #5217548 09/20/19 01:52 AM
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Originally Posted by ChrisD46
Hyundai/Kia allow the use of 5W20 , 5W30 and 10W30 based on ambient temps the owner expects to use the vehicle during the OCI ... My 2.4L GDI engine oil smells strongly of gas by the 3K mile mark ,so I go up a grade over a 3,750 mile OCI using a 5W30 D1/G2 rated synthetic just to have some head room in case of fuel dilution .

๐Ÿ‘... smart move. I am thankful that Hyundai/Kia provides owners with flexibility in choice of grade.

Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Whammo] #5217560 09/20/19 04:01 AM
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Railrust Offline
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I often think of this myself...am I just part of a CAFE regulation scheme by the manufacturer to get my vehicle any advantage for a slight uptick in fuel economy, while not doing what is best for my engine because the manufacturer won't be responsible when it's out of warranty.

My truck calls for 0W20, but I wonder if it would be better to run 0W30 or 5W30? I do smell fuel in that oil at times when I empty my catch can....others times not so much. And others that own the GM direct injected 5.3 have reported fuel dilution in their oil samples (and certainly oil consumption).

Last edited by Railrust; 09/20/19 04:01 AM.

2018 Chevy Silverado 5.3
2007 Lexus LS460 (deceased)
2008 Honda CRV
(Whatever synthetic oil is on sale or rebate)
Re: Is fuel dilution taken into account when they recommend xw-20? [Re: ChrisD46] #5217577 09/20/19 04:55 AM
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demarpaint Offline
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Originally Posted by ChrisD46
Hyundai/Kia allow the use of 5W20 , 5W30 and 10W30 based on ambient temps the owner expects to use the vehicle during the OCI ... My 2.4L GDI engine oil smells strongly of gas by the 3K mile mark ,so I go up a grade over a 3,750 mile OCI using a 5W30 D1/G2 rated synthetic just to have some head room in case of fuel dilution .

That is precisely what I instructed my son to do when he bought a new KIA last year. I told him to run Mobil 1 EP 5W30, and stick to a 4K OCI.


God Bless Our Troops

Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Whammo] #5217588 09/20/19 05:28 AM
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ZeeOSix Offline
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How about the new DI cars specifying 0W-16. They better not be big fuel dilluters.

Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Railrust] #5217589 09/20/19 05:29 AM
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ZeeOSix Offline
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Originally Posted by Railrust
I often think of this myself...am I just part of a CAFE regulation scheme by the manufacturer to get my vehicle any advantage for a slight uptick in fuel economy, while not doing what is best for my engine because the manufacturer won't be responsible when it's out of warranty.


Yep, pretty much. But most street cars are not driven very hard, which helps them last with thinner oil.

Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Whammo] #5217630 09/20/19 07:03 AM
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ATex7239 Offline
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The evidence would suggest no


'12 Buick Enclave 173K
Valvoline ML SynBlend 5w30
ACDelco PF63E

'17 Ford Fusion (Company Vehicle) 90K
Oil - Don't know
Filter - Don't care
Re: Is fuel dilution taken into account when they recommend xw-20? [Re: ZeeOSix] #5217631 09/20/19 07:05 AM
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Mr Nice Offline
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Originally Posted by ZeeOSix
How about the new DI cars specifying 0W-16. They better not be big fuel dilluters.

Yep.

Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Whammo] #5217649 09/20/19 07:29 AM
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4WD Online Confused
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My 2010 5.3L was 6 quarts of 5w30
My 2018 5.3L is 8 quarts of 0w20
Several other mechanical changes

Re: Is fuel dilution taken into account when they recommend xw-20? [Re: Whammo] #5217652 09/20/19 07:31 AM
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BMWTurboDzl Offline
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Evidence suggests that some fuel dilution is not an issue so I imagine yes they took that into consideration.


โ€œIt took untold generations to get you where you are. A little gratitude might be in order. If youโ€™re going to insist on bending the world to your way, you better have your reasons.โ€

435i
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