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Viscosity Question #4477014
08/01/17 10:39 PM
08/01/17 10:39 PM
Joined: Jan 2011
Posts: 2,400
In The Region Between
Cristobal Offline OP
Cristobal  Offline OP
Joined: Jan 2011
Posts: 2,400
In The Region Between
My Avalon has gone about 250,000 miles on a 1MZ-FE engine, and I live in a very hot climate during the summer. My mechanic says that in hot weather with a motor this old that 5W-30 is best not used, and a 20W-50 oil is better. What are your thoughts?


Surrounded by ferocious, snarling, & spoiled Poodles!




Re: Viscosity Question [Re: Cristobal] #4477018
08/01/17 10:42 PM
08/01/17 10:42 PM
Joined: Jun 2003
Posts: 17,341
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,341
Deplorable in apple valley, ca
He is wrong


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Viscosity Question [Re: Cristobal] #4477019
08/01/17 10:43 PM
08/01/17 10:43 PM
Joined: Mar 2012
Posts: 1,276
San Antonio, TX
E150GT Online content
E150GT  Online Content
Joined: Mar 2012
Posts: 1,276
San Antonio, TX
Nah


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 57k 10w30
2006 Buick Lucerne CXL 3.8 31k 5w30
Re: Viscosity Question [Re: Cristobal] #4477029
08/01/17 10:54 PM
08/01/17 10:54 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Thicker viscosity is used to eliminate mechanical noise, not so much for high temps, unless the oil is thinning out so much that it causes noise. Use your ears to tell if you need to go thicker.

Re: Viscosity Question [Re: Cristobal] #4477030
08/01/17 10:54 PM
08/01/17 10:54 PM
Joined: Dec 2006
Posts: 18,615
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline
Joined: Dec 2006
Posts: 18,615
Dallas,Tx USA
Keep using the manual recommended viscosity.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 5W20

Re: Viscosity Question [Re: Cristobal] #4477032
08/01/17 10:55 PM
08/01/17 10:55 PM
Joined: Oct 2002
Posts: 36,280
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,280
Great Lakes
Are you having a problem with your engine? If not, don't try to fix it. Keep doing what you're doing.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (FF)
Re: Viscosity Question [Re: Merkava_4] #4477048
08/01/17 11:12 PM
08/01/17 11:12 PM
Joined: Sep 2015
Posts: 5,839
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,839
Kalifornia Kollective
Originally Posted By: Merkava_4
Thicker viscosity is used to eliminate mechanical noise, not so much for high temps, unless the oil is thinning out so much that it causes noise. Use your ears to tell if you need to go thicker.


+1 smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Viscosity Question [Re: Cristobal] #4477070
08/02/17 12:40 AM
08/02/17 12:40 AM
Joined: Sep 2015
Posts: 2,256
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,256
Malaysia
250,000 miles and hot weather, go thicker than OEM's ...... yes.
20W50 without SN/A3B4 ....... no.
xW40 with A3B4/SM SN .. yes.

Re: Viscosity Question [Re: Cristobal] #4477072
08/02/17 12:51 AM
08/02/17 12:51 AM
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
He is probably well meaning but unfortunately uneducated in the matter. 20w50s are usually much thicker than necessary for this type of application. The thickest I would go is 10w40, and only if trying to combat a leak or consumption. Maxlife 5w30 would be fine.


2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
Re: Viscosity Question [Re: Cristobal] #4477079
08/02/17 01:48 AM
08/02/17 01:48 AM
Joined: Oct 2015
Posts: 2,650
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline
Joined: Oct 2015
Posts: 2,650
Balearic Islands , Spain
Don't trust mechanics in things like motor oil choice, they think they know what they're talking about, even though in many cases they don't, i have heard some lousy advice on motor oil first hand from some mechanics.

If it doesn't burn oil and has good oil pressure, there is no point in using an oil thicker than the manufacturer's spec.

Short answer : NO, it will not protect it better


1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.
Re: Viscosity Question [Re: FordCapriDriver] #4477081
08/02/17 02:01 AM
08/02/17 02:01 AM
Joined: Sep 2015
Posts: 2,256
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,256
Malaysia
Originally Posted By: FordCapriDriver
Don't trust mechanics in things like motor oil choice,.......

..neither is Bitog.

Re: Viscosity Question [Re: Cristobal] #4477091
08/02/17 04:12 AM
08/02/17 04:12 AM
Joined: May 2005
Posts: 10,268
ROCHESTER, NY
Char Baby Offline
Char Baby  Offline
Joined: May 2005
Posts: 10,268
ROCHESTER, NY
If you're not having any issues with the engine such as oil burning/oil loss, I would stay with what you are using/doing now. No issues?-change nothing!


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX(17K)
Re: Viscosity Question [Re: Cristobal] #4477092
08/02/17 04:29 AM
08/02/17 04:29 AM
Joined: Jun 2015
Posts: 66
VA, US
SoNic67 Offline
SoNic67  Offline
Joined: Jun 2015
Posts: 66
VA, US
At 250K the engine is not the same as new, the advice to increase viscosity is sensible, especially in the summer. Probably even the manual recommended 40 anyway for very hot climates.
I would not jump to 50, use a 10W40, they are not that hard to find.

The argument that "if it worked until now, don't change it" is stupid. Based on that there is no wear in the mechanical world, cars should last forever and never-ever break, because "it worked before".

Re: Viscosity Question [Re: zeng] #4477098
08/02/17 04:56 AM
08/02/17 04:56 AM
Joined: Oct 2015
Posts: 2,650
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline
Joined: Oct 2015
Posts: 2,650
Balearic Islands , Spain
Originally Posted By: zeng
Originally Posted By: FordCapriDriver
Don't trust mechanics in things like motor oil choice,.......

..neither is Bitog.

I would say most BITOG members could give much better oil advice than most mechanics.


1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.
Re: Viscosity Question [Re: Cristobal] #4477106
08/02/17 05:22 AM
08/02/17 05:22 AM
Joined: Jul 2005
Posts: 30,416
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,416
NY
Originally Posted By: Cristobal
My Avalon has gone about 250,000 miles on a 1MZ-FE engine, and I live in a very hot climate during the summer. My mechanic says that in hot weather with a motor this old that 5W-30 is best not used, and a 20W-50 oil is better. What are your thoughts?


Going up a grade in hot weather with an older engine that has problems isn't a bad idea. No problems no point in changing grades. If I were to bump a grade in warm weather, I'd bump one grade, like move up from a 5w30 to a 5W40 or 10W40. I would not jump from 5W30 to 20W50 in one jump. I wouldn't be asking for or taking oil advise from a mechanic.


God Bless Our Troops

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