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#4657367 - 02/05/18 07:32 PM What exactly is the A5/B5 and why is it dropping?
tempnexus Offline


Registered: 02/11/16
Posts: 67
Loc: NM
What exactly is the A5/B5 and why is being discontinued or dropping out of all the future formulations?! I thought the higher the number the better the oil but I guess not.

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#4657372 - 02/05/18 07:35 PM Re: What exactly is the A5/B5 and why is it dropping? [Re: tempnexus]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35561
Loc: Great Lakes
It's ACEA A1/B1 that was discontinued.

And no, the higher the number does not mean better. Just like dexos2 is not better than dexos1. They are just different specs.

https://www.oilspecifications.org/articles/acea-good-bye-a1-b1-welcome-c5.php
_________________________
'02 530i (Edge HM 10W-40)
'15 Q5 3.0T (Edge 5W-40)

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#4657394 - 02/05/18 08:00 PM Re: What exactly is the A5/B5 and why is it dropping? [Re: tempnexus]
bigjl Offline


Registered: 09/06/12
Posts: 2202
Loc: London, England
Also I don’t remember seeing an oil that was just A1/B1 for years they usually always meet A5/B5.
_________________________
07 Pilot EX-L 2WD 124k U/K Honda Filter
16 S350d LWB 22k Mobil Super 3000 XE 5w30
17 Smart ForFour Auto 4.5k Mobil 1 0w40 FS

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#4657395 - 02/05/18 08:02 PM Re: What exactly is the A5/B5 and why is it dropping? [Re: tempnexus]
rooflessVW Offline


Registered: 12/24/11
Posts: 3660
Loc: North Carolina
The only oil I know offhand that meets A5/B5 is Pennzoil Platinum 5W-30.

I've decided it's probably easier and most likely better long term to just use an A3/B4.
_________________________
"Zed's dead baby, Zed's dead."

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#4657409 - 02/05/18 08:23 PM Re: What exactly is the A5/B5 and why is it dropping? [Re: bigjl]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 5828
Loc: USA
The reason they no longer meet A5/B5 is because they can't pass a new test added to the ACEA 2016 sequence, but that new test is done on a diesel engine and really only relevant to diesels.

Castrol promised a revised formula that would meet the new A5/B5-16, but it doesn't seem to have been released.

Valvoline tries to use a disclaimer that their synthetic 5w30 meets A5/B5 for gasoline engines only, but ACEA does not allow this. If it doesn't meet the standards for both gas *and* diesel engines, it doesn't meet them at all!

Originally Posted By: bigjl
Also I don’t remember seeing an oil that was just A1/B1 for years they usually always meet A5/B5.


0w20 and 5w20 synthetics were A1/B1 but not A5/B5 because A5/B5 requires HTHS of at least 2.9,m whereas A1/B1 allowed an exception for __w20 where the HTHS could be 2.6

and as QP said, ACEA recently dropped A1/B1.

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#4657432 - 02/05/18 09:10 PM Re: What exactly is the A5/B5 and why is it dropping? [Re: rooflessVW]
madeej11 Online   content


Registered: 06/22/15
Posts: 64
Loc: montreal ,canada
Looks like all 3 tiers of Amsoil 5w30 pcmo's claim or rather recommended A5/B5

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#4657539 - 02/05/18 11:52 PM Re: What exactly is the A5/B5 and why is it dropping? [Re: bigjl]
Garak Offline


Registered: 12/05/09
Posts: 24051
Loc: Regina, Saskatchewan, Canada
Originally Posted By: bigjl
Also I don’t remember seeing an oil that was just A1/B1 for years they usually always meet A5/B5.

There were/are some in North America, but both those are somewhat uncommon.
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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#4657583 - 02/06/18 04:55 AM Re: What exactly is the A5/B5 and why is it dropping? [Re: Garak]
bigjl Offline


Registered: 09/06/12
Posts: 2202
Loc: London, England
Originally Posted By: Garak
Originally Posted By: bigjl
Also I don’t remember seeing an oil that was just A1/B1 for years they usually always meet A5/B5.

There were/are some in North America, but both those are somewhat uncommon.


The last A1/B1 only oil i saw was a Semi Synthetic and that was years ago now.

Its the spec that Fords used to specify in the UK before they introduced the Ford Specific spec
_________________________
07 Pilot EX-L 2WD 124k U/K Honda Filter
16 S350d LWB 22k Mobil Super 3000 XE 5w30
17 Smart ForFour Auto 4.5k Mobil 1 0w40 FS

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#4657763 - 02/06/18 09:27 AM Re: What exactly is the A5/B5 and why is it dropping? [Re: tempnexus]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2320
Loc: Balearic Islands , Spain
Both A1/B1 and A5/B5 are fuel economy oriented specifications, from what i understand A5/B5 is basically the spec that replaces A1/B1.
_________________________
1975 Ford Capri II Ghia 3000 V6
1988 Ford Escort 1.6 Xr3i Convertible
Finnish expat living in Spain
My clothes smell like 15W-40 HDEO and 20W-50.

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#4658509 - 02/06/18 09:53 PM Re: What exactly is the A5/B5 and why is it dropping? [Re: bigjl]
Garak Offline


Registered: 12/05/09
Posts: 24051
Loc: Regina, Saskatchewan, Canada
Originally Posted By: bigjl
The last A1/B1 only oil i saw was a Semi Synthetic and that was years ago now.

Our M1 products had just that for a while, not to mention any 20 grades that wouldn't normally get A5/B5 by reason of HTHS in the first place. Of course, as A5/B5-2016 was coming down the pipe, a M1 and Castrol got rid of A5/B5 and Valvoline was doing their A5/B5 but for gasoline engines only business. wink
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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#4658697 - 02/07/18 06:11 AM Re: What exactly is the A5/B5 and why is it dropping? [Re: tempnexus]
supercity Offline


Registered: 06/12/12
Posts: 1141
Loc: Australia
Lots of euro 20 grades are A1/B1. They'll soon be C5 rated.

There are not many manufacturers that ask for A5/B5 in their gasoline enginess

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