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#4448803 - 07/03/17 09:02 PM ACEA A5/B5 question
Nissan101 Offline


Registered: 08/13/15
Posts: 412
Loc: Caribbean
I must first apologize if this is a stupid question or if it had been discussed before.
A oil that pass this standard (ACEA A5/B5).
Is it a good oil?

Would this oil be good for a turbo charged vehicle?
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#4448808 - 07/03/17 09:04 PM Re: ACEA A5/B5 question [Re: Nissan101]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 5817
Loc: USA
Yes, A5/B5 is good oil, but what kind of turbocharged vehicle is it?

In the Caribbean, where temperatures are higher, perhaps A3/B4 might be better, though. A3/B4 corresponds to the thicker oils (some heavier 30's, and most 40's), while A5/B5 corresponds to thinner oils (most 30's)

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#4448819 - 07/03/17 09:11 PM Re: ACEA A5/B5 question [Re: slacktide_bitog]
Nissan101 Offline


Registered: 08/13/15
Posts: 412
Loc: Caribbean
Its a 5w40 oil.
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#4448820 - 07/03/17 09:12 PM Re: ACEA A5/B5 question [Re: Nissan101]
Nissan101 Offline


Registered: 08/13/15
Posts: 412
Loc: Caribbean
So there is a chance that there will be some consumption issues, because currently im using 20w50.
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#4448826 - 07/03/17 09:17 PM Re: ACEA A5/B5 question [Re: Nissan101]
Nissan101 Offline


Registered: 08/13/15
Posts: 412
Loc: Caribbean
Another reason im considering and having questions about this oil, is that i can obtain it cheap. :_)
Its a fully synthetic oil too.
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#4448837 - 07/03/17 09:29 PM Re: ACEA A5/B5 question [Re: Nissan101]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 5817
Loc: USA
Originally Posted By: Nissan101
Its a 5w40 oil.



impossible for a 5w40 to be A5/B5 (that spec requires HTHS under 3.5)

The applicable standard is A3/B4

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#4448845 - 07/03/17 09:32 PM Re: ACEA A5/B5 question [Re: slacktide_bitog]
Nissan101 Offline


Registered: 08/13/15
Posts: 412
Loc: Caribbean

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#4448846 - 07/03/17 09:33 PM Re: ACEA A5/B5 question [Re: Nissan101]
Nissan101 Offline


Registered: 08/13/15
Posts: 412
Loc: Caribbean
Thats what the website says......and im not too educated on the various certifications except the normal API SM/SN etc.
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#4448925 - 07/03/17 11:32 PM Re: ACEA A5/B5 question [Re: Nissan101]
Gokhan Online   content


Registered: 12/29/10
Posts: 2949
Loc: Los Angeles, California
Technically it's possible to be both ACEA A3/B4 and A5/B5 at the same time if HTHSV = 3.5 cP exactly because of a loophole in the ACEA definition.

Is this GDI? What's the recommended oil?
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#4448962 - 07/04/17 12:16 AM Re: ACEA A5/B5 question [Re: Nissan101]
Flying_A Offline


Registered: 10/14/11
Posts: 282
Loc: San Francisco, CA
The HTHS of 3.5 is on the thin side for a 5w40, it should be > 3.5 mPA.s otherwise it would be considered a "fuel efficiency" type formulation, hence the A5/B5 designation like the OP stated.

An A3/B4 or a C3 oil would be a better recommendation if oil consumption were a concern.



Edited by Flying_A (07/04/17 12:22 AM)
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#4448996 - 07/04/17 02:37 AM Re: ACEA A5/B5 question [Re: Nissan101]
Garak Offline


Registered: 12/05/09
Posts: 24051
Loc: Regina, Saskatchewan, Canada
Originally Posted By: Nissan101
Its a 5w40 oil.

In reference to what slacktide_bitog mentioned, it seems unlikely it would be A5/B5. It may technically be possible, but it's a fine line. A5/B5 can have an HTHS of 3.5 or lower. A 10w-40 must have an HTHS of 3.5 or higher. So, there's a fine line to walk there. It cannot be below 3.5 and remain a 10w-40 by SAE J300, and cannot go above 3.5 and be A5/B5.
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#4449000 - 07/04/17 02:45 AM Re: ACEA A5/B5 question [Re: Garak]
SR5 Offline


Registered: 07/07/15
Posts: 4285
Loc: Down Under
Originally Posted By: Garak
Originally Posted By: Nissan101
Its a 5w40 oil.

In reference to what slacktide_bitog mentioned, it seems unlikely it would be A5/B5. It may technically be possible, but it's a fine line. A5/B5 can have an HTHS of 3.5 or lower. A 10w-40 must have an HTHS of 3.5 or higher. So, there's a fine line to walk there. It cannot be below 3.5 and remain a 10w-40 by SAE J300, and cannot go above 3.5 and be A5/B5.


Exactly, which makes me nervous. How does it pass the stay-in-grade shear stability test without using up some KV100 and HTHS headroom that it never had to begin with ?

I don't trust a A5/B5 5W40, it can only exist on the borders of reality, who would formulate to a line when most formulate to be clearly in a well defined area for a grade.
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#4449009 - 07/04/17 03:53 AM Re: ACEA A5/B5 question [Re: slacktide_bitog]
weasley Offline


Registered: 03/13/13
Posts: 709
Loc: UK
Originally Posted By: slacktide_bitog
Originally Posted By: Nissan101
Its a 5w40 oil.



impossible for a 5w40 to be A5/B5 (that spec requires HTHS under 3.5)


Exactly this. It is practically impossible to have an oil which is precisely 3.5 cP HTHS, which is the only theoretical way of having a 5W-40 A5/B5. Furthermore it is vanishingly unlikely that a 5W-40, even on the 3.5 cP knife-edge, will pass the fuel economy engine test requirements of A5/B5.

Their wording suggests that the oil meets some performance requirements of ACEA A5/B5, but I doubt very much they are signed up to the EELQMS Letter of Conformance which is required if you want to make ACEA claims.
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#4449156 - 07/04/17 08:49 AM Re: ACEA A5/B5 question [Re: Nissan101]
Nissan101 Offline


Registered: 08/13/15
Posts: 412
Loc: Caribbean
So according to what you all say, this oil will be quick to shear down to a 5w30?
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#4449169 - 07/04/17 09:01 AM Re: ACEA A5/B5 question [Re: Nissan101]
Nissan101 Offline


Registered: 08/13/15
Posts: 412
Loc: Caribbean
On the container it states its ILSAC GF-5. Also it also says that it passed ACEA A5/B5. Now im thinking if this oil is cheap for a reason :-(
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