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Re: Why do people run higher weight oil in summer? [Re: dave1251] #5122001 06/01/19 08:26 AM
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JohnnyJohnson Offline
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Originally Posted by dave1251
Originally Posted by Dave9
Originally Posted by Whammo
I have seen a lot of people recommend running a 5w30 instead of a 5w20 in summertime. As far as I know, the engine operating temp isn't going to be higher in the summer. If the manual says 5w20 is fine year round, why mess with it?

The manual is about fuel economy numbers mandated by the EPA/nonsense.

As far as you know, is wrong. The engine operating temp is higher in summer. Realize that there is a delayed reaction. The thermostat is set for a temp, but the cylinder temp is higher when the ambient is.

The radiator fan is set for a temp, but again it is a delayed reaction. It matters less today with modern oils, especially synthetic, but ultimately there is no magic here.

The base oil weight is what dictates steady state operation. The -V weight just dictates the cold flow. The second number is what you pick for the operational environment at normal ambient and running temp.

Ignore this if you wish.



It's not about ignoring anything. The OEM states what grade to use. I have used other than the recommended grade because I know using a 30 grade where a 20 grade is recommended because extra human hair thickness won't hurt anything. All you stated is 20 grade recommendation is for better fuel economy which is true but there is no evidence using a 30 grade provides longer engine life over a 20 grade.



Well a couple months ago I did my spring OCI. Most of my driving is in Severe service city and secondary roads. My car delivered its highest MPG ever in this service with 10w-30 Havoline Pro DS 36 MPG +. This is one person that does not believe the CAFE thinner oil higher MPG myth.

Final cost of my oil is the determining factor 99% of the time. I almost change name brands every OCI. Oh and on occasion I use HM because it was the cheapest. The bottom line is all oil is oil.


2004 Corolla 135453
Out: EDGE EP 5W-30 Bosch 3311 7156 Miles
In: Havoline Pro DS 10w-30 Purolator PureOne 3-14-19 129693
2006 Duramax 76414
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: Why do people run higher weight oil in summer? [Re: Whammo] #5122019 06/01/19 08:40 AM
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rooflessVW Offline
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I don't run a thicker oil in the summer.

I run a thinner oil in winter.


"Zed's dead baby, Zed's dead."
Re: Why do people run higher weight oil in summer? [Re: Whammo] #5122022 06/01/19 08:43 AM
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PimTac Offline
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Running a thicker grade in summer goes back to the straight grade days. There is no need to change anything with modern oils.


2017 Mazda CX5
Havoline Pro DS 0w20
Roki OEM filter.
Re: Why do people run higher weight oil in summer? [Re: JohnnyJohnson] #5122024 06/01/19 08:45 AM
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4WD Offline
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Oh, I guess these OEM’s and oil companies never dyno tested with sophisticated instrumentation …
and never field tested with QAQC boundaries …
You should call them about the 0w20 myth …

Re: Why do people run higher weight oil in summer? [Re: rooflessVW] #5122112 06/01/19 09:59 AM
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oil_film_movies Offline
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Originally Posted by rooflessVW
I don't run a thicker oil in the summer. I run a thinner oil in winter.
Any reasons for that? I hope I can ask you without hurting your feelings. Another profanity-laced tirade and/or profane graphics like you posted recently, would not further the purpose of these forums. You understand that, right? Of course, you didn't get banned from your cursing & posting graphics before, so it must be OK to do, according to the Moderators.

Re: Why do people run higher weight oil in summer? [Re: Whammo] #5122118 06/01/19 10:11 AM
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RDY4WAR Offline
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I've observed very minimal change in operating oil temperature with changes to ambient temperature. I used 10w-30 in my '66 Mustang 289 engine and it would stay around 220*F oil temp cruising down the highway regardless if it was 20*F in January or 100*F in July. The oil would reach 220*F quicker during the summer, but that's a good thing. I see no reason to run a higher grade oil in the summer.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: Why do people run higher weight oil in summer? [Re: 4WD] #5122213 06/01/19 11:54 AM
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Mad_Hatter Offline
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Originally Posted by 4WD
Oh, I guess these OEM’s and oil companies never dyno tested with sophisticated instrumentation …
and never field tested with QAQC boundaries …
You should call them about the 0w20 myth …


Wait, are you suggesting there's data to support those mfg recommendations in the event the mfg needs to fend off some class action lawsuit alleging they knowingly recommended the wrong oil type/grade?

That's just crazy talk...😂

Re: Why do people run higher weight oil in summer? [Re: oil_film_movies] #5122247 06/01/19 12:39 PM
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rooflessVW Offline
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Originally Posted by oil_film_movies
Originally Posted by rooflessVW
I don't run a thicker oil in the summer. I run a thinner oil in winter.
Any reasons for that?

Because a 50 is a little clickity-clackity on cold starts if I have to leave the car outside for a few hours, and I don't get any track time during the colder months any way. Not that I think you really want to know beyond having a reason to start another argument.

I deleted the rest of your post because it didn't add anything to the discussion, and I'm not going to let you bait me again.


"Zed's dead baby, Zed's dead."
Re: Why do people run higher weight oil in summer? [Re: Whammo] #5122279 06/01/19 01:15 PM
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userfriendly Offline
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In my 6.6L duramax (more than one Durami?) I typically run 5W40 in the winter, 15W40 spring & fall and SAE 40 in the summer.
Perhaps I should switch to 15W50 spring, summer and fall?

BTW, the only Duramax that listed XW30 as an optional grade was my first, a 360 HP LBZ.
The 2 others: LML and L5P only approve 5W40 and 15W40,
When ambient allows, 15W40 is the preferred grade.

Re: Why do people run higher weight oil in summer? [Re: eljefino] #5122301 06/01/19 01:43 PM
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RamFan Offline
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Originally Posted by eljefino
Originally Posted by pbm
Because they want to use up their stash of CLEARANCE oils.


LOL the real answer. And mine.


Me three. For the Mazda I’ve built a stash of 0w20, 5w30 and 10w30 purchased from various clearance/sale/rebate events. In the winter I always use 0w20, but now that my warranty is up I’ve started dipping into the 5w30 for summer use. When that is gone, I’ll mix 0w20 and 10w30 (1.5 to 1) for summer use.


18 Giulia Ti Sport Q4
  • 2.0T I4 - 16k - PP Euro LX 0w30 - Mobil 1 - 10k/1yr

16.5 CX-5 Touring AWD
  • 2.5L I4 - 63k - Castrol Edge EP 0w20 - Denso - 7.5k/1yr
Re: Why do people run higher weight oil in summer? [Re: Whammo] #5122306 06/01/19 01:47 PM
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Nickdfresh Offline
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Originally Posted by Whammo
I have seen a lot of people recommend running a 5w30 instead of a 5w20 in summertime. As far as I know, the engine operating temp isn't going to be higher in the summer. If the manual says 5w20 is fine year round, why mess with it?


I wouldn't in a newer vehicle, especially under warranty. But some cars burn oil as they age...

Re: Why do people run higher weight oil in summer? [Re: Whammo] #5122349 06/01/19 02:33 PM
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Are you talking about the vehicles that specifically allow thicker oils in the owners manual, for example for my girlfriend's 2013 Sonata? It got 5w30 last time, instead of 5w20. The manual says it's fine.


84 Olds Cutlass - 350 Olds
83 Chevy Caprice - 305 Sbc
79 Honda CX500
Re: Why do people run higher weight oil in summer? [Re: Whammo] #5122388 06/01/19 03:19 PM
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dailydriver Offline
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With a fuel diluting (albeit yes, less likely in the summer), small sump capacity (4.2 quarts), TURBO direct injected engine of 1.6 liter displacement, with a marginal factory cooling system, and an aftermarket, not vented skid plate, and no hood vents, running as hard as I tend to push it, yeah, I WILL go up to a medium weight HTHSV 5W-30 in the summer. drive

(ESPECIALLY since this same EXACT car's manual in Europe/rest of world explicitly allows for this. wink )


2016 Ford Fiesta ST 17K miles
Ravenol REP 5W-30
Fram XG3600 filter
Ravenol MTF-2 in the IB6 transaxle
Re: Why do people run higher weight oil in summer? [Re: Whammo] #5122488 06/01/19 06:06 PM
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Within the next 2-3 days I will be stepping up from 0w-20 to 5w-30 in the 2016 Accord. The reasons for this, listed in order of decreasing importance, include all of the following:

  • Poor UOA results showing double the levels of Al and Fe for this engine
  • Fuel dilution due to direct injection, leading to lower operating viscosity
  • Hot weather - this vehicle will be running 100 miles per day in temperatures between 75 and 105F.

As you can see, summer temperatures are a factor, but a small one. Most vehicles will exhibit higher oil temperatures in the summer months. Six months from now I should have some objective data to share.


'01 Volvo V70XC, 243k, 10W-30 M1 High Mileage
'16 Accord, 40k, 5W-30 M1 EP
Re: Why do people run higher weight oil in summer? [Re: dave1251] #5122838 06/02/19 08:06 AM
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alarmguy Offline
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Originally Posted by dave1251
Originally Posted by RayCJ
Here's a couple direct quotes from a Mazda3 owner's manual. Read between the lines and it says, 0w-20 gives better fuel economy and 5w-20 or 5w-30 lubricate the engine better. FWIW, I use the USA recommended viscosity year round.




You came to the conclusion you wanted. The term is confirmation bias I believe.


All over the world except the USA (and maybe canada) Mazda 3 manual says its ok or recommended to use 5w30.
Again, makes much more sense choosing an oil for your climate, then choosing an oil by brand when something like Super Tech, lubricates just as good and anything else in the same API. :o).


14 Road King (current)
08 VStar 1300 Tourer
07 Suzuki C50
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