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#4663224 - 02/11/18 05:23 PM Going from 5w30 to 5w40?
zeke1985 Offline

Registered: 09/14/11
Posts: 127
Loc: Kenutcky
2005 Chevy Malibu Maxx lt v6 3.5, 145,000 miles. Lots of city stop and go driving. Anyway I have been talking to a rep from liqui moly about oil recommendations, he told me to use 5w40 in my car since it's higher mileage even though it calls for 5w30. Also he said it wouldn't hurt my oil seals to switch from using a non high mileage oil, the people at pennzoil also said this. Do both of these sound right? Thanks.

Edited by zeke1985 (02/11/18 05:24 PM)

#4663234 - 02/11/18 05:42 PM Re: Going from 5w30 to 5w40? [Re: zeke1985]
salesrep Offline

Registered: 08/22/03
Posts: 3600
Loc: lllinois
Seals will not be a problem switching. Id stick with the 5-30, though going to the 5-40 in all likely hood will be ok.
High quality Specialized Lubricants pay for themselves!

#4663237 - 02/11/18 05:45 PM Re: Going from 5w30 to 5w40? [Re: zeke1985]
BobsArmory Offline

Registered: 03/28/10
Posts: 1320
Loc: Michigan
I've done it in the past with no issues. couldn't even see a drop in MPG.
Keeping the forces of evil at bay
2016 Chevy Malibu LT 1.5 Liter Turbo
2017 Chevy Equinox LT 2.4 Liter

#4663238 - 02/11/18 05:45 PM Re: Going from 5w30 to 5w40? [Re: zeke1985]
Leo99 Offline

Registered: 03/30/14
Posts: 3041
Loc: NJ
I have been using 10w40 HM in my rav4 that calls for 5w30 for the past 100k miles. Probably going to a 50 weight once the weather warms.

I use all kinds of oil in it. The seals leak a little. They're going to leak.
Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles
2004 Rav4 359,000 miles
2015 Camry 59,000 miles

#4663239 - 02/11/18 05:49 PM Re: Going from 5w30 to 5w40? [Re: zeke1985]
simple_gifts Offline

Registered: 07/26/04
Posts: 11945
Loc: Middlesex County CT
What problem are you trying to solve? If the answer is 'none i can think of' why switch?

Edited by simple_gifts (02/11/18 05:49 PM)
2004 Prius; 92K ML Syn 5W-30
2007 Yaris 68K 0w-40 Castrol
2006 B2300;130K;ALM

Was driving an ox cart; Now on the USS Enterprise

#4663245 - 02/11/18 06:02 PM Re: Going from 5w30 to 5w40? [Re: zeke1985]
Alex_V Offline

Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
While there's miniscule chance it'll make any negative difference, if the engine is quiet and doesn't use any oil I see no point in it - just move up to a HM 5w30. The reasons to move to a thicker oil are:
Reducing consumption from cylinder or ring wear (thicker oil doesn't get past rings as badly)
Compensating for increased tolerances between moving parts (thicker oil = thicker cushion between parts that have more slop in them than they should)
Insuring adequate protection of moving parts in higher temperatures or compensating for shear or fuel dilution which thins the oil

The goal of regular maintenance with good fluids is to prevent wear. 145K should only be about half the lifespan of a well maintained 3.5, or many other engines. If you feel you've accomplished that goal of keeping long-term engine wear to a minimum and are only using the car as it was designed to be used, then there should be no need for thicker oil.

There's nothing really special about the 3.5 - just an update of the 3.1/3.4. They'll run hundreds of thousands of miles on conventional. If oil reps laid out the straight-up facts without bias they wouldn't have a job because it's
been proven time and time again that most engines don't need $7/qt. synthetic to wear the rest of the machine they're in completely out from around them, sometimes twice.

Edited by Alex_V (02/11/18 06:17 PM)
I like Chevy and Valvoline.

'13 Cruze, 1.4T, 112K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 167K
'67 Suburban, 350, 331K

#4663257 - 02/11/18 06:19 PM Re: Going from 5w30 to 5w40? [Re: zeke1985]
SR5 Offline

Registered: 07/07/15
Posts: 4462
Loc: Down Under
I switch between 5W30 - 10W30 - 0W40 - 5W40 - 10W40 - 15W40 all the time. All Good and never a problem. No oil leaks, no oil consumption.

My '06 GM 4-cylinder has different ignition advance depending on fuel octane used, it's about 3% power difference according to published figures. I can just feel this slight difference when I step it up a fuel grade. However I have just changed my oil from an ILSAC 5W30 (M1) to a Euro 10W40 (Penrite A3/B4), and with the oil change I can feel no difference in engine pep or fuel economy.

Sure a thicker oil technically has more viscous drag, but it's well less than 3%, and you will never notice it in regular day to day driving.

Cars don't run on one oil viscosity only, they run on a range of suitable viscosities. You will be fine.
Penrite Vantage 10W40 SN & A3/B4 + Wesfil-Cooper Z154

#4663259 - 02/11/18 06:20 PM Re: Going from 5w30 to 5w40? [Re: zeke1985]
JustN89 Offline

Registered: 06/27/17
Posts: 470
Loc: DFW
It will not make any difference in switching, so why bother? If you're not leaking, then your seals are holding up. The answer to stop-and-go driving is not switching viscosity in a non-GDI engine (especially to an out-of-spec oil), instead you will want to go to more frequent OCIs. With what you have described, I would run whatever was cheapest (in a 5W-30) at 6 month intervals.

#4663275 - 02/11/18 06:52 PM Re: Going from 5w30 to 5w40? [Re: simple_gifts]
Oro_O Offline

Registered: 09/20/14
Posts: 1351
Loc: Seattle-ish, WA
Originally Posted By: simple_gifts
What problem are you trying to solve? If the answer is 'none i can think of' why switch?

Exactly. +1.

I wouldn't substitute one oil that works well for another with a higher content of VIIs and a lower content of, well, "oil." If I WERE to make a change, if I still lived in Louisville (used to), I would be switching from 5w-30 to a more robust, climate-appropriate oil like 10w-30. This would also address the issue of more severe service that you indicate concerns you. If you want a great oil for your climate, recommended spec, robust for hard use, and good on seals, look at M1 10w-30 HM.

#4663300 - 02/11/18 07:37 PM Re: Going from 5w30 to 5w40? [Re: zeke1985]
zeng Offline

Registered: 09/01/15
Posts: 2188
Loc: Malaysia
What LM/Pennzoil guys say are factually correct.
Would 5W30 hurts ? No.

But I would personally 'prefer' a 5W40 LM for it's added ACEA A3B4/C3 and various Euro OEM approvals.
Do I require those Euro approvals in my Yota? No.

Edited by zeng (02/11/18 07:38 PM)

#4663307 - 02/11/18 07:50 PM Re: Going from 5w30 to 5w40? [Re: zeke1985]
mclasser Offline

Registered: 04/13/13
Posts: 2229
Loc: The Northeast
I'm running Castrol 5w40 in my Infiniti that specs 5w30. No problems at all, and this car is parked outside and only used for short trips.
2018 Hyundai Elantra VE -- 3K
2013 Honda Pilot EX-L 4WD -- 55K
2002 Honda Accord EX-L -- 210K

#4663368 - 02/11/18 08:52 PM Re: Going from 5w30 to 5w40? [Re: mclasser]
Garak Offline

Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
Yes, and I ran 5w-40 in my Infiniti, too, and no complaints, and still am running a high HTHS 5w-30, quite happily, too!
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

#4663698 - 02/12/18 09:51 AM Re: Going from 5w30 to 5w40? [Re: mclasser]
mightymousetech Offline

Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Originally Posted By: mclasser
I'm running Castrol 5w40 in my Infiniti that specs 5w30. No problems at all, and this car is parked outside and only used for short trips.

Yup. Run 0W40 in my car that calls for 5W30.
Mighty Mouse Tech
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2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL