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#4505180 - 09/02/17 08:26 AM Back Spec oil weights.
tig1 Offline


Registered: 01/03/09
Posts: 13724
Loc: Illinois
Toyota and Honda back spec'd oil wt to 0-5-20 several years ago. Doesn't CAFE have effect on a current model year or does CAFE go back several years from the present? If only the current year, why back spec oil weights.
_________________________
2007 Ford Fusion 228,000 miles
M1 0-20 EP
2017 Ford Fusion 52K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#4505186 - 09/02/17 08:31 AM Re: Back Spec oil weights. [Re: tig1]
Shannow Online   content


Registered: 12/12/02
Posts: 40195
Loc: 'Stralia
I've posted those rules before.

You could use the search function.

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#4505189 - 09/02/17 08:32 AM Re: Back Spec oil weights. [Re: tig1]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: Boston, MA
Beats me. Plenty of good 5W 30 around. My 08 Camry V6 manual indicates 5W 30 and I'm sticking with it.

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#4505207 - 09/02/17 08:54 AM Re: Back Spec oil weights. [Re: Shannow]
tig1 Offline


Registered: 01/03/09
Posts: 13724
Loc: Illinois
Originally Posted By: Shannow
I've posted those rules before.

You could use the search function.


That doesn't help me. Refresh us. I've never had success doing that.


Edited by tig1 (09/02/17 09:01 AM)
_________________________
2007 Ford Fusion 228,000 miles
M1 0-20 EP
2017 Ford Fusion 52K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#4505293 - 09/02/17 10:28 AM Re: Back Spec oil weights. [Re: tig1]
Gebo Offline


Registered: 09/18/02
Posts: 2154
Loc: VA
Tig1, I'm with you. I'll go back through Shannow's old posts and see if I can find it or us.


Edited by Gebo (09/02/17 10:28 AM)
_________________________
'98 LEX LS400 280K
'00 LEX GS300 195K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K


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#4505308 - 09/02/17 10:48 AM Re: Back Spec oil weights. [Re: tig1]
Gebo Offline


Registered: 09/18/02
Posts: 2154
Loc: VA
Oops, I give up. I forgot how many posts he has! frown
_________________________
'98 LEX LS400 280K
'00 LEX GS300 195K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K


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#4505314 - 09/02/17 10:55 AM Re: Back Spec oil weights. [Re: tig1]
ndfergy Offline


Registered: 03/28/16
Posts: 422
Loc: burlington ,ontario, canada
Use Google search instead.

In this case try:

cafe site:bobistheoilguy.com
_________________________
2015 Toyota Yaris 5spd Manual
Summer: Mobil Super 1000 10w30
Winter: Mobil Super 1000 5w30
OEM Filter

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#4505363 - 09/02/17 11:27 AM Re: Back Spec oil weights. [Re: tig1]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 18307
Loc: Dallas,Tx USA
Originally Posted By: tig1
Toyota and Honda back spec'd oil wt to 0-5-20 several years ago. Doesn't CAFE have effect on a current model year or does CAFE go back several years from the present? If only the current year, why back spec oil weights.


I'm with tig on this one. That Acura oil chart confused me even more haha. 10W30-5W30 was the only spec at first,and said 20wts were "usable and acceptable". Now they all spec 20wts without the terms "usable and acceptable".

1. Did they figure out that 20wts control wear better?
2. Have oils excelled to the point that today's thin oils have a concoction of additives that don't rely on viscosity?
3. Is the movement to thinner oils purely CAFE?

Now I'm even more confused shocked2
_________________________
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 5W30


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#4505400 - 09/02/17 11:51 AM Re: Back Spec oil weights. [Re: aquariuscsm]
car51 Offline


Registered: 03/12/15
Posts: 10382
Loc: Southwest PA
Originally Posted By: aquariuscsm
Originally Posted By: tig1
Toyota and Honda back spec'd oil wt to 0-5-20 several years ago. Doesn't CAFE have effect on a current model year or does CAFE go back several years from the present? If only the current year, why back spec oil weights.


I'm with tig on this one. That Acura oil chart confused me even more haha. 10W30-5W30 was the only spec at first,and said 20wts were "usable and acceptable". Now they all spec 20wts without the terms "usable and acceptable".

1. Did they figure out that 20wts control wear better?
2. Have oils excelled to the point that today's thin oils have a concoction of additives that don't rely on viscosity?
3. Is the movement to thinner oils purely CAFE?

Now I'm even more confused shocked2


I believe it's CAFE

I'm fine running 5w and 10w30's in my Camry with no ill effects
_________________________
2009 Toyota Camry LE

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#4505438 - 09/02/17 12:47 PM Re: Back Spec oil weights. [Re: tig1]
callbay Offline


Registered: 05/29/05
Posts: 815
Loc: Ozark Mountains
It seems like I am hearing about more new vehicles are calling for 5-30 now.

I have run 5-30 in everything I have ever owned that called for 5-20 and no blown engines. A few I have run 5-40 in some and no problems either. 100reds of thousands of miles.

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#4505439 - 09/02/17 12:47 PM Re: Back Spec oil weights. [Re: tig1]
Coprolite Offline


Registered: 07/03/11
Posts: 1224
Loc: Houston, TX
IIRC CAFE only matters for the current model year. As it is on average sold, I guess the definition of that would be most recent full model year?

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#4505455 - 09/02/17 01:12 PM Re: Back Spec oil weights. [Re: tig1]
ndfergy Offline


Registered: 03/28/16
Posts: 422
Loc: burlington ,ontario, canada
Although I'm not literate on all the machinations of cafe credits, I agree, it seems kind of goofy to back spec oil recommendations if no monetary incentive is involved...or is there?

Here's a theory:
Since Toyota USA et al are separate entities within the corporate infrastructure they have their own set of rights, profits and liabilities to consider in determining their business model. Given that, at the dealer level profits could be increased if expenses are lowered. One way of doing that is to maximize bulk oil purchase to as few grades as possible.

To illustrate this, I requested an oil change with synthetic oil for my Yaris at the dealership back in 2015. They were prepared to put in 0W20 instead of the recommended 5W30. When asked why they claimed they only carry 0W20 synthetic.
_________________________
2015 Toyota Yaris 5spd Manual
Summer: Mobil Super 1000 10w30
Winter: Mobil Super 1000 5w30
OEM Filter

Top
#4505726 - 09/02/17 07:04 PM Re: Back Spec oil weights. [Re: Coprolite]
Shannow Online   content


Registered: 12/12/02
Posts: 40195
Loc: 'Stralia
Originally Posted By: Coprolite
IIRC CAFE only matters for the current model year. As it is on average sold, I guess the definition of that would be most recent full model year?


https://bobistheoilguy.com/forums/ubbthreads.php/topics/2658661/Re:_CAFE_has_Little_to_do_with#Post2658661

Quote:
What are CAFE credits?

Manufacturers can earn CAFE “credits” to offset deficiencies in their CAFE performances. Specifically, when the average fuel economy of either the passenger car or light truck fleet for a particular model year exceeds the established standard, the manufacturer earns credits. The amount of credit a manufacturer earns is determined by multiplying the tenths of a mile per gallon that the manufacturer exceeded the CAFE standard in that model year by the amount of vehicles they manufactured in that model year. These credits can be applied to any three consecutive model years immediately prior to or subsequent to the model year in which the credits are earned. The credits earned and applied to the model years prior to the model year for which the credits are earned are termed “carry back” credits, while those applied to model years subsequent to the model year in which the credits are earned are known as “carry forward” credits. Failure to exercise carry forward credits within the three years immediately following the year in which they are earned will result in the forfeiture of those credits. Credits cannot be passed between manufacturers or between fleets, e.g., from domestic passenger cars to light trucks.


So yes, they can get credit for backspeccing...

Nice try 'though tig1...

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#4505740 - 09/02/17 07:21 PM Re: Back Spec oil weights. [Re: Shannow]
ndfergy Offline


Registered: 03/28/16
Posts: 422
Loc: burlington ,ontario, canada
Thanks. Theory buster extraordinaire. I mean that in a good way smile
_________________________
2015 Toyota Yaris 5spd Manual
Summer: Mobil Super 1000 10w30
Winter: Mobil Super 1000 5w30
OEM Filter

Top
#4505754 - 09/02/17 07:39 PM Re: Back Spec oil weights. [Re: tig1]
slacktide_bitog Online   content


Registered: 03/20/08
Posts: 6388
Loc: USA
Toyota Canada even back spec'd the Mk4 Supra turbo 2JZ to 5w20 crzy LOL

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