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if you use 5w40 after 5w30 can you go back? #5279015 11/27/19 03:57 PM
Joined: Jul 2019
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Polyalphaolefin Offline OP
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Hello! I drive KIA Ceed 1.4 MPI, and alowed oil viscosities by the user manual are: 5w30, 0w40, 5w40, depending on climate.

So, I plan to use 5w30 (or 0w40) on colder months, and 5w40 at summer.

But I heard, once you switch to thicker oil (from 5w30 to 5w40) you can not go back to thinner (from 5w40 to 5w30). Any truth about that? Thanks


Car: KIA Ceed JD 1.4 MPI
OIL: 5w30 ACEA A5 / A3; 5w40 ACEA A3; 0w40 ACEA A3
Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5279018 11/27/19 04:00 PM
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Jimmy_Russells Offline
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Originally Posted by Polyalphaolefin
Any truth about that?



No


Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5279021 11/27/19 04:01 PM
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SubieRubyRoo Offline
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You can freely use any oil that meets the specifications in your owner's manual regardless of weight.

Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5279022 11/27/19 04:01 PM
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Mitsu_Joe Offline
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True!
I am at this point running 500w-1200 in my thirty year old car as I always prefer switching to a thicker oil during summer. ;-)

Joking aside, there is no scientific background to that.
The viscosity choice you made (5w30 in winter, 5w40 in summer) seems very fitting and should work perfectly fine.

Last edited by Mitsu_Joe; 11/27/19 04:01 PM.

1988 Mitsubishi Galant, Meguin SL 5W-40


Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5279026 11/27/19 04:03 PM
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jqgz Offline
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No issues. Just change it regularly and use a good filter.

Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5279036 11/27/19 04:12 PM
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JLTD Offline
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Originally Posted by Polyalphaolefin

But I heard, once you switch to thicker oil (from 5w30 to 5w40) you can not go back to thinner (from 5w40 to 5w30). Any truth about that? Thanks



No truth involved. Whoever told you that is....shall we say, misinformed.


I use the overseas manual to choose my viscosity.


Hers: 2008 Jeep Liberty 154k, SS 5w30/Amsoil
Looking at options.

His: 2015 4Runner 60k, SS 5w20/Amsoil

Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5279041 11/27/19 04:19 PM
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supton Offline
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Switch away freely.


2011 Toyota Camry, base, 2.5L/6MT, 198k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 156k, ours
1999 Toyota Camry LE, 2.2L/4AT, 219k, his
Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5279481 11/28/19 07:12 AM
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mpack88 Offline
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I used traveller 10w30 Dino in a 85 Chevy caprice wagon 305v8 that always got 20w50. It runs better on the thinner weight and puts more power out. However it does seem to leak more. Car has over 400k miles.

Re: if you use 5w40 after 5w30 can you go back? [Re: mpack88] #5279566 11/28/19 08:58 AM
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bullwinkle Online Confused
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Originally Posted by mpack88
I used traveller 10w30 Dino in a 85 Chevy caprice wagon 305v8 that always got 20w50. It runs better on the thinner weight and puts more power out. However it does seem to leak more. Car has over 400k miles.

Holy carp! How many camshafts, carburetor rebuilds, and sets of valve seals did it take to go that far? (Might be able to tell I've had a few pre-EFI Chevy SBs) crazy


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5279578 11/28/19 09:11 AM
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bulwnkl Offline
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Originally Posted by Polyalphaolefin
I heard, once you switch to thicker oil (from 5w30 to 5w40) you can not go back to thinner (from 5w40 to 5w30). Any truth about that? Thanks


No. I went from 0w20 to 5w20 to 5w40 and back to 0w20 recently. No issues. The engine doesn’t care.


I use speech recognition frequently. Please excuse any consequent grammatical or typographical errors.
Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5279586 11/28/19 09:20 AM
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Mad_Hatter Offline
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Originally Posted by Polyalphaolefin
Hello! I drive KIA Ceed 1.4 MPI, and alowed oil viscosities by the user manual are: 5w30, 0w40, 5w40, depending on climate.

So, I plan to use 5w30 (or 0w40) on colder months, and 5w40 at summer.

But I heard, once you switch to thicker oil (from 5w30 to 5w40) you can not go back to thinner (from 5w40 to 5w30). Any truth about that? Thanks

No, no truth whatsoever. And it sounds like a solid plan. But remember, once you go thick you may never go back!πŸ˜‚

Last edited by Mad_Hatter; 11/28/19 09:23 AM.
Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5279990 11/28/19 07:49 PM
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wemay Offline
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I do it in my wife's 2.0T all the time. Zero issues


2018 KIA Sportage LX AWD
Shell RGT 5W20, STP S2808

2013 Hyundai Santa Fe Sport 2.0T
M1AP 5W30, M1-104
Re: if you use 5w40 after 5w30 can you go back? [Re: wemay] #5280029 11/28/19 09:18 PM
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Malo83 Offline
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PP 5w30 year round in my 2.0T, no need for musical oils. LOL

Re: if you use 5w40 after 5w30 can you go back? [Re: Polyalphaolefin] #5280094 11/29/19 12:30 AM
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Mad_Hatter Offline
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Originally Posted by Malo83
PP 5w30 year round in my 2.0T, no need for musical oils. LOL

The OP could just run a thick, +11/+12cSt Xw30 year round and not have to do the musical oils.πŸ˜‰ I know he's in the EU but the Havoline 5/30 HiMi SB I run from time to time is a 11.8cSt lube.

"But what about CAFE"...meh, never heard of her!πŸ˜‚

Last edited by Mad_Hatter; 11/29/19 12:32 AM.
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