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5w-20 vs 5w-30 #5361144 02/26/20 11:59 PM
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joel95ex Offline OP
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i don't care about fuel economy, but would like your opinions about when the manual says both 5w-20 and 5w-30 are acceptable. i've always run 5 or 10w-30 in my vehicles. climate is not a concern as i live where it's well-within all of the temp ranges. vehicle is a 2018 santa fe with the 2.4 gdi


95 Accord 4cyl Vtec. 500,000+miles. RIP 😢
13 sonata killed by a deer @ 156k miles
07 civic SI 179k miles PP, M1 10w-30 fram ultra
18 santa fe 55k PP 5w-30 oem filter
Re: 5w-20 vs 5w-30 [Re: joel95ex] #5361148 02/27/20 12:13 AM
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GMBoy Offline
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I think like you, and also being in Texas, I prefer 5W/30 as well. I run 5W/30 in a Jeep and a RAM that call for 5W/20 but both motors were originally (in years past) spec'd 5w/30 so it is a safe choice for HEMI and Pentastar motors. All my GM's are running 5w/30 as well.

Re: 5w-20 vs 5w-30 [Re: joel95ex] #5361151 02/27/20 12:16 AM
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blufeb95 Offline
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I'd stick with the 30 weight, most would suggest using that in Hyundai GDI engines when permitted to help counter any possible fuel dilution issues.

Re: 5w-20 vs 5w-30 [Re: joel95ex] #5361161 02/27/20 12:31 AM
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tundraotto Offline
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Interesting quandary - by nature a 5W-20 generally has to consist of better base oils than a 5W-30 has to...but I would choose a 5W-30 since its GDI and you cannot extend the OCI too much for fuel dilution anyway.

Re: 5w-20 vs 5w-30 [Re: blufeb95] #5361163 02/27/20 12:34 AM
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csandste Offline
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Originally Posted by blufeb95
I'd stick with the 30 weight, most would suggest using that in Hyundai GDI engines when permitted to help counter any possible fuel dilution issues.

I've run 5w20 without incident but now use 5w30 in my Soul . For reasons listed by blufeb95.

Last edited by csandste; 02/27/20 12:34 AM.

2017 Kia Soul+ Valvoline Daily Protection 5w30+ a bit of Harvest King syn 5w30-- 75,000 miles
Re: 5w-20 vs 5w-30 [Re: joel95ex] #5361167 02/27/20 12:39 AM
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ZeeOSix Offline
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Originally Posted by joel95ex
i don't care about fuel economy, but would like your opinions about when the manual says both 5w-20 and 5w-30 are acceptable.


5W-30 ... and the manual even gives you that option.

Re: 5w-20 vs 5w-30 [Re: joel95ex] #5361168 02/27/20 12:39 AM
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blufeb95 Offline
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[Linked Image]
I'd consider running 10w30 in it, since it's permissible above 0F , I assume it never gets that cold in Texas

Re: 5w-20 vs 5w-30 [Re: joel95ex] #5361171 02/27/20 12:54 AM
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tundraotto Offline
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^seeing that I would just run the cheapest synthetic 10W-30 also....

Re: 5w-20 vs 5w-30 [Re: joel95ex] #5361175 02/27/20 01:04 AM
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Marco620 Offline
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I ran 10w30 Pennzoil Ultra on my Hyundai during summer. Rest of year was 5w30


15' Civic 1.8 i-vtec 319,500 mi M1 0w30 & LG Biotech,Castrol CVT Fluid,GUMOUT/ PEA
Doberman Whisperer! HondaGuru.
E pluribus unum.

Re: 5w-20 vs 5w-30 [Re: joel95ex] #5361178 02/27/20 01:15 AM
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Mad_Hatter Offline
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Unless you get below 0f or expect to travel somewhere where you'll be starting really cold, there's no reason why you couldn't run a 10w30. If I lived down south like you do, that's prolly what I'd run year round. QS, Chevron Supreme, Valvoline, Wally's ST.. make great syn, syn blends and dino's in a 10w30. You just need to decide how long you want to push out your drain intervals.

Last edited by Mad_Hatter; 02/27/20 01:17 AM.
Re: 5w-20 vs 5w-30 [Re: tundraotto] #5361200 02/27/20 03:31 AM
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Shannow Offline
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Originally Posted by tundraotto
Interesting quandary - by nature a 5W-20 generally has to consist of better base oils than a 5W-30 has to..


Does it ?

how have you determined this ?


If it's the truth....it can handle the pressure !!!
Re: 5w-20 vs 5w-30 [Re: Shannow] #5361201 02/27/20 03:36 AM
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tundraotto Offline
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Originally Posted by Shannow
Originally Posted by tundraotto
Interesting quandary - by nature a 5W-20 generally has to consist of better base oils than a 5W-30 has to..


Does it ?

how have you determined this ?


Am I wrong?

Re: 5w-20 vs 5w-30 [Re: tundraotto] #5361208 02/27/20 04:15 AM
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Shannow Offline
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I am asking you to provide evidence of your claim...I in't make either a claim, nor a counter, just asking to be educated on your statement of fact...easy peasy...


If it's the truth....it can handle the pressure !!!
Re: 5w-20 vs 5w-30 [Re: joel95ex] #5361220 02/27/20 05:02 AM
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SR5 Offline
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easy peasy lemon squeezy

I would suggest that most 5W30, 10W30 and 5W20 synthetics are Group III
Sure others exist, but Group III is heavily used in this application.

Last edited by SR5; 02/27/20 05:04 AM.

---------------------------------------------------------------------------------
Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
Re: 5w-20 vs 5w-30 [Re: SR5] #5361221 02/27/20 05:04 AM
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bbhero Offline
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Originally Posted by SR5
easy peasy lemon squeezy

I would suggest that most 5W30 and 5W20 synthetics are Group III
Sure others exist, but Group III is heavily used in this application.



Interestingly the full synthetic Cam2 Dexos1 Gen 2 oil has 25-40 percent Pao in it per the SDS. I found that interesting when I checked up on it.


Nissan Altima 3.5 Coupe
Cam2 Full synthetic 5w30 Carquest Blue 84356
"Treat your family like your friends and treat your friends like your family."
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