ACEA

[Bullwinkle007]

What is the big difference in a/3 B4 a5/b5?
Is at/b5 better?

 

[Panos]

https://bobistheoilguy.com/forums/ubbthreads.php/topics/4048837/A3/B4_vs_A5/B5
It was the first result on Google searching for "a3/b4 vs a5/b5".

 

[dubber09]

The biggest difference is A5/B5 are 'energy conserving' oils and come in lower viscosities only.

 

[Linctex]

Originally Posted by Bullwinkle007

Is a5/b5 better?


only for better fuel economy (or so they say)

 

[OilUzer]

a1/b1 is obsolete
a3/b3 and a3/b4 are higher hths iirc

I like higher hths oils but currently using a5/b5 ... If your engine is under high load and/or racing or high rpm or Italian driving ... I would use higher hths

 

[dubber09]

There are also C2 and C3 oils that can be considered

 

[BobGoblin]

A3/B4 is higher HTHS viscosity (min 3,5), and A5/B5 is lower HTHS viscosity (min 2,9), so it has fuel economy properties.

Same as C class. C1 and 2 are low HTHS (2,9) - compared to A5, and C3 and C4 are higher HTHS 3,5. But C has lower sulphated ash comparing to A/B to preserve DPF or TWC catalyst.

 

[Bullwinkle007]

Originally Posted by Panos
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4048837/A3/B4_vs_A5/B5
It was the first result on Google searching for "a3/b4 vs a5/b5".

Sorry. I was really tired, and posted before I looked.

 

[dave1251]

Well the what is the ACEA attempting to accomplish? The OEM'S recommending this standard have a higher percentage of engine failures versus their Japanese and American counterparts. Is this enough information to start a BITOG conspiracy?

 

[ka9mnx]

ACEA is a spec just like API, ILSAC and SAE. ACEA cannot fix poor engineering.