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0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? #4709099
03/28/18 12:00 AM
03/28/18 12:00 AM
Joined: Feb 2003
Posts: 6,160
Cajun Country, La.
BlueOvalFitter Offline OP
BlueOvalFitter  Offline OP

Joined: Feb 2003
Posts: 6,160
Cajun Country, La.
The engine in my 07 F150 is spec'd 5W20. In 1997, its 1st year in production, it was spec'd 5W30. In 2000 Ford spec'd 5W20, and back spec'd 5W20. I have used whatever weight oil I wanted to and it is still running with over 150K miles.
I have been doing a lot of reading about 0W40 in engines such as mine. There are mixed opinions about it and how it can ruin my engine. Some are even stating that using a 0W40 in a 0W20 spec'd engine will ruin it as well. Some are positive responses. Such as, use it over any other oil. It will protect your engine, esp. at start up and operating temperature.
What gives? I have had PP EURO 0W40 in my engine for almost a month, maybe more, and it has NEVER run as quiet as it does now. Am I reading opinions from "ARMCHAIR QUARTERBACKS" or people that actually know what they're talking about?
shrug ??? confused


2007 F150, 4.2 V6
Havoline HM 5W20, NAPA GOLD FIL-1516 MC FL-400S
"One Box, One OCI!"
Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709114
03/28/18 12:51 AM
03/28/18 12:51 AM
Joined: Jun 2012
Posts: 1,870
USA
oldhp Offline
oldhp  Offline

Joined: Jun 2012
Posts: 1,870
USA
I just put PP 5W30 in my 2010 Ford Ranger 2.3, never been quieter. I use PP 5W30 in my 16' Challenger R/T Hemi 6 speed, quiet as a church mouse. Going to use PP 5W30 in my 17' Jeep 3.6 next oil change. I'm done with 5W20.

Last edited by oldhp; 03/28/18 12:51 AM.

2018 RAM 1500 3.6/8 speed.
2019 Dodge Charger SXT 3.6/8 speed.
"When others cut you down, remember where they came from."
Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709115
03/28/18 12:51 AM
03/28/18 12:51 AM
Joined: Aug 2008
Posts: 3,602
Where the wind comes sweepin'
Reddy45 Offline
Reddy45  Offline

Joined: Aug 2008
Posts: 3,602
Where the wind comes sweepin'
oh no!

Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709117
03/28/18 12:57 AM
03/28/18 12:57 AM
Joined: Jan 2014
Posts: 408
Slimy Mudhole
Darwin1138 Offline
Darwin1138  Offline

Joined: Jan 2014
Posts: 408
Slimy Mudhole
You need to answer some simple questions.

1. What is the operational temperature of the oil in your engine?

2. What is the viscosity of the 5W-20 oil at that temperature?
If we trust the people that designed the engine, then we can assume that this viscosity is somewhere in the range of viscosities that will give the engine the best protection. We dont know how narrow or how wide is this range.

3. What is the viscosity of the 0W-40 oil at that temperature?

4. Does this new viscosity is inside that range?

To put you an example. Assume that your engine operates at 100C and that the viscosity of the 0W-40 oil at 100C is the same as the 5W-20 oil at 80C. in that case using the 0W-40 oil is the same as operating your engine permanently at 80C. Do you think this could ruin your engine or not?

Obviously you will need to calculate the real numbers to get a definitive answer.

Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709122
03/28/18 01:12 AM
03/28/18 01:12 AM
Joined: Dec 2002
Posts: 42,756
'Stralia
Shannow Offline
Shannow  Offline

Joined: Dec 2002
Posts: 42,756
'Stralia
What are the failure mechanisms that they are citing ?

Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709123
03/28/18 01:22 AM
03/28/18 01:22 AM
Joined: Jun 2003
Posts: 2,825
BC, Canada
userfriendly Offline
userfriendly  Offline

Joined: Jun 2003
Posts: 2,825
BC, Canada
I've gone a step further and put 15W40, SAE40 and 20W50 in several xW20 engines. See my last few "post your last oil change" posts. Today 10w40 in a 2013 Matrix. 70K miles on it now, been on thick oil since new, just one example.
Last fall 0w40 went in an 07 Highlander hybrid. Before that my mother's Windstar vans, a few Taurus wagons, Chrysler Intrepid, cammed American V-8s etc.

Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709124
03/28/18 01:25 AM
03/28/18 01:25 AM
Joined: Jul 2010
Posts: 20,731
PNW
ZeeOSix Offline
ZeeOSix  Offline

Joined: Jul 2010
Posts: 20,731
PNW
Originally Posted By: BlueOvalFitter
Am I reading opinions from "ARMCHAIR QUARTERBACKS" or people that actually know what they're talking about?
shrug ??? confused


Where you been reading this stuff?

Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709128
03/28/18 01:59 AM
03/28/18 01:59 AM
Joined: Dec 2009
Posts: 27,072
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline

Joined: Dec 2009
Posts: 27,072
Regina, Saskatchewan, Canada
If 0w-40 is somehow going to make an engine speced for a 0w-20 or a 5w-20 in your climate fail, they'd be in real trouble up here with a 0w-20 when winter hits. Historically, automakers have specified a range of viscosities for different ambients. The armchair guys are the ones falling for the trap in the manual that 0w-20 must be used under all conditions lest the sky fall.


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: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709130
03/28/18 02:31 AM
03/28/18 02:31 AM
Joined: Oct 2008
Posts: 4,213
Kuwait
Falcon_LS Offline
Falcon_LS  Offline

Joined: Oct 2008
Posts: 4,213
Kuwait
No idea what they're talking about.

I'm running German (now Belgian) Castrol Edge 0W-40 in my 5W-30 spec'd GM LL8 for over 65,000 miles and 6 years without a single issue. Heck GM's export spec calls for ACEA A3! My 4.6L 2V equipped Expedition supposedly spec'd for 5W-20 runs Motul 8100 X-Cess 5W-40, as does my Grand Marquis with a modified 4.6L 2V that sees WOT very regularly. My LY7 equipped Cadillac, spec'd for 5W-30 also runs Motul 8100 X-Cess 5W-40, as does the Mitsu which recommends viscosity based on ambient temperature. The Cologne SOHC equipped Explorer, also spec'd for 5W-30, runs Castrol Edge 0W-40. I could care less about CAFE or fuel economy.


Petro-Canada Duron HP 15W-40 CK-4/SN
99 Explorer: H17W02
00 Pajero: XG9688
01 Grand Marquis: XG2
03 Expedition SSV: XG2
05 Envoy: XG9837
06 XJ8L: C2C41611
07 SRX: XG8765
Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709134
03/28/18 02:48 AM
03/28/18 02:48 AM
Joined: Jun 2003
Posts: 2,825
BC, Canada
userfriendly Offline
userfriendly  Offline

Joined: Jun 2003
Posts: 2,825
BC, Canada
On the contrary, I experience better fuel economy with thicker oils. Within reason of course. I'm beginning to think that a VII containing engine oil of the same grade, may provide better fuel economy than an engine oil without.

We know how temporary shear works in the bearing space with RPM rise, but how do VII's act on cylinder walls under stress?

Does the engine oil thin from shear and reduce friction?

Last edited by userfriendly; 03/28/18 02:49 AM.
Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709135
03/28/18 02:59 AM
03/28/18 02:59 AM
Joined: Dec 2002
Posts: 42,756
'Stralia
Shannow Offline
Shannow  Offline

Joined: Dec 2002
Posts: 42,756
'Stralia
mid stroke is high shear as well.

Honda have started increasing main bearing size and reducing clearances, actions that increase drag/friction, but increase MOFT...they are doing that while still reducing viscosity, apparently in an effort to balance that off against piston assembly friction.

(OTR concepts use thermal barrier coatings mid stroke on the coolant side to drop the local viscosity - that's where I think passenger cars will ultimately go)

edit...devcon block filler sounds like a plan.

Last edited by Shannow; 03/28/18 03:00 AM.
Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: Falcon_LS] #4709139
03/28/18 03:29 AM
03/28/18 03:29 AM
Joined: Dec 2009
Posts: 27,072
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline

Joined: Dec 2009
Posts: 27,072
Regina, Saskatchewan, Canada
Originally Posted By: Falcon_LS
I'm running German (now Belgian) Castrol Edge 0W-40 in my 5W-30 spec'd GM LL8 for over 65,000 miles and 6 years without a single issue. Heck GM's export spec calls for ACEA A3!

And that export spec says a lot, too. General Motors engines, including the one in your Envoy, had been calling for 30 grades with low HTHS for decade after decade, although with warnings against the garbage 10w-40 offerings from way back, yet an appropriate A3 option clearly didn't spook them.


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: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709143
03/28/18 03:52 AM
03/28/18 03:52 AM
Joined: Apr 2012
Posts: 10,644
Kendall, FL
wemay Offline
wemay  Offline

Joined: Apr 2012
Posts: 10,644
Kendall, FL
trolling


18 KIA Sportage 2.4 AWD
QSUD 5W-20, PH9688

13 Hyundai Santa Fe Sport 2.0T
PP EuroL 5W-30, OE
Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709146
03/28/18 04:11 AM
03/28/18 04:11 AM
Joined: Dec 2017
Posts: 4,135
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline

Joined: Dec 2017
Posts: 4,135
SE British Columbia, Canada
Were in this together, through thick and thin. LOL


If you want the job done right......do it yourself.
Re: 0W40 Can Ruin A 5W20/5W30 Oil Spec'd Engine? [Re: BlueOvalFitter] #4709150
03/28/18 04:21 AM
03/28/18 04:21 AM
Joined: Dec 2002
Posts: 42,756
'Stralia
Shannow Offline
Shannow  Offline

Joined: Dec 2002
Posts: 42,756
'Stralia
Yep, "they" always have to "contribute" to any discussion...same as "IBTL" in other threads.

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