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Going from 5w30 to 5w40? #4663224
02/11/18 06:23 PM
02/11/18 06:23 PM
Joined: Sep 2011
Posts: 141
Denver, CO
zeke1985 Offline OP
zeke1985  Offline OP

Joined: Sep 2011
Posts: 141
Denver, CO
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.

Last edited by zeke1985; 02/11/18 06:24 PM.
Re: Going from 5w30 to 5w40? [Re: zeke1985] #4663234
02/11/18 06:42 PM
02/11/18 06:42 PM
Joined: Aug 2003
Posts: 3,613
lllinois
salesrep Offline
salesrep  Offline

Joined: Aug 2003
Posts: 3,613
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!
Re: Going from 5w30 to 5w40? [Re: zeke1985] #4663237
02/11/18 06:45 PM
02/11/18 06:45 PM
Joined: Mar 2010
Posts: 1,383
Michigan
BobsArmory Offline
BobsArmory  Offline

Joined: Mar 2010
Posts: 1,383
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
Re: Going from 5w30 to 5w40? [Re: zeke1985] #4663238
02/11/18 06:45 PM
02/11/18 06:45 PM
Joined: Mar 2014
Posts: 3,802
NJ
Leo99 Offline
Leo99  Offline

Joined: Mar 2014
Posts: 3,802
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 (RIP)
2004 Corolla 125,000 miles
2004 Rav4 370,000 miles
2015 Camry 70,000 miles
Re: Going from 5w30 to 5w40? [Re: zeke1985] #4663239
02/11/18 06:49 PM
02/11/18 06:49 PM
Joined: Jul 2004
Posts: 12,131
Middlesex County CT
simple_gifts Offline
simple_gifts  Offline

Joined: Jul 2004
Posts: 12,131
Middlesex County CT
What problem are you trying to solve? If the answer is 'none i can think of' why switch?

Last edited by simple_gifts; 02/11/18 06:49 PM.

2004 Prius; 110K; ASL
2007 Yaris 86K 0w-40 Castrol
2006 B2300;132K;ALM


Was driving an ox cart; Now on the USS Enterprise
Re: Going from 5w30 to 5w40? [Re: zeke1985] #4663245
02/11/18 07:02 PM
02/11/18 07:02 PM
Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Alex_V Offline
Alex_V  Offline

Joined: Apr 2016
Posts: 1,202
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.

Last edited by Alex_V; 02/11/18 07:17 PM.

To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Going from 5w30 to 5w40? [Re: zeke1985] #4663257
02/11/18 07:19 PM
02/11/18 07:19 PM
Joined: Jul 2015
Posts: 4,706
Down Under
SR5 Offline
SR5  Offline

Joined: Jul 2015
Posts: 4,706
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.


---------------------------------------------------------------------------------
Castrol GTX Ultraclean 15W40 A3/B3 + Wesfil-Cooper Z154
Re: Going from 5w30 to 5w40? [Re: zeke1985] #4663259
02/11/18 07:20 PM
02/11/18 07:20 PM
Joined: Jun 2017
Posts: 733
DFW
JustN89 Offline
JustN89  Offline

Joined: Jun 2017
Posts: 733
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.

Re: Going from 5w30 to 5w40? [Re: simple_gifts] #4663275
02/11/18 07:52 PM
02/11/18 07:52 PM
Joined: Sep 2014
Posts: 1,547
Seattle-ish, WA
Oro_O Offline
Oro_O  Offline

Joined: Sep 2014
Posts: 1,547
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.

Re: Going from 5w30 to 5w40? [Re: zeke1985] #4663300
02/11/18 08:37 PM
02/11/18 08:37 PM
Joined: Sep 2015
Posts: 2,559
Malaysia
zeng Offline
zeng  Offline

Joined: Sep 2015
Posts: 2,559
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.

Last edited by zeng; 02/11/18 08:38 PM.
Re: Going from 5w30 to 5w40? [Re: zeke1985] #4663307
02/11/18 08:50 PM
02/11/18 08:50 PM
Joined: Apr 2013
Posts: 2,557
The Northeast
mclasser Offline
mclasser  Offline

Joined: Apr 2013
Posts: 2,557
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
2013 Honda Pilot EX-L 4WD
2002 Honda Accord EX-L

Re: Going from 5w30 to 5w40? [Re: mclasser] #4663368
02/11/18 09:52 PM
02/11/18 09:52 PM
Joined: Dec 2009
Posts: 26,867
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline

Joined: Dec 2009
Posts: 26,867
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, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: Going from 5w30 to 5w40? [Re: mclasser] #4663698
02/12/18 10:51 AM
02/12/18 10:51 AM
Joined: Apr 2017
Posts: 1,520
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline

Joined: Apr 2017
Posts: 1,520
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
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
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