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#4477014 - 08/01/17 10:39 PM Viscosity Question
Cristobal Offline


Registered: 01/02/11
Posts: 2400
Loc: 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?
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#4477018 - 08/01/17 10:42 PM Re: Viscosity Question [Re: Cristobal]
Chris142 Offline


Registered: 06/05/03
Posts: 16835
Loc: 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
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#4477019 - 08/01/17 10:43 PM Re: Viscosity Question [Re: Cristobal]
E150GT Offline


Registered: 03/11/12
Posts: 1109
Loc: San Antonio, TX
Nah
_________________________
1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 250k 5w30
2016 Mazda6 Touring 6MT - 56k 10w30

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#4477029 - 08/01/17 10:54 PM Re: Viscosity Question [Re: Cristobal]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: 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.

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#4477030 - 08/01/17 10:54 PM Re: Viscosity Question [Re: Cristobal]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18178
Loc: Dallas,Tx USA
Keep using the manual recommended viscosity.
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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
Pennzoil Platinum 0W20



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#4477032 - 08/01/17 10:55 PM Re: Viscosity Question [Re: Cristobal]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35885
Loc: 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)
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#4477048 - 08/01/17 11:12 PM Re: Viscosity Question [Re: Merkava_4]
BrocLuno Offline


Registered: 09/06/15
Posts: 5526
Loc: 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
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4477070 - 08/02/17 12:40 AM Re: Viscosity Question [Re: Cristobal]
zeng Offline


Registered: 09/01/15
Posts: 2189
Loc: Malaysia
250,000 miles and hot weather, go thicker than OEM's ...... yes.
20W50 without SN/A3B4 ....... no.
xW40 with A3B4/SM SN .. yes.

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#4477072 - 08/02/17 12:51 AM Re: Viscosity Question [Re: Cristobal]
901Memphis Offline


Registered: 08/14/10
Posts: 12893
Loc: 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

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#4477079 - 08/02/17 01:48 AM Re: Viscosity Question [Re: Cristobal]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2384
Loc: 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, - Valvoline VR1 20W-50
1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Shell Rimula R4X 15W-40 HDEO.

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#4477081 - 08/02/17 02:01 AM Re: Viscosity Question [Re: FordCapriDriver]
zeng Offline


Registered: 09/01/15
Posts: 2189
Loc: Malaysia
Originally Posted By: FordCapriDriver
Don't trust mechanics in things like motor oil choice,.......

..neither is Bitog.

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#4477091 - 08/02/17 04:12 AM Re: Viscosity Question [Re: Cristobal]
Char Baby Offline


Registered: 05/25/05
Posts: 10028
Loc: 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"
'06 Mazda 3i 2.0L
'15 Nissan Altima 2.5 SV

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#4477092 - 08/02/17 04:29 AM Re: Viscosity Question [Re: Cristobal]
SoNic67 Offline


Registered: 06/06/15
Posts: 66
Loc: 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".

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#4477098 - 08/02/17 04:56 AM Re: Viscosity Question [Re: zeng]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2384
Loc: 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, - Valvoline VR1 20W-50
1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Shell Rimula R4X 15W-40 HDEO.

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#4477106 - 08/02/17 05:22 AM Re: Viscosity Question [Re: Cristobal]
demarpaint Offline


Registered: 07/03/05
Posts: 29797
Loc: 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.
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