Using a ACEA A3/B4 oil in a A5/B5 engine

[edyvw]

My statement was regarding A3/B4 vs A5/B5 as the topic asks. Are you saying there is not any difference in fuel economy between those two standards?

Your statement reads that 5W30 A3 and A5 will have similar fuel economy. You signaled out 0W40. Impact on fuel economy by 5W30 or 0W40 A3 will be same compared to A5. That is all I am saying.

 

[ka9mnx]

Per ACEA:

Viscosity
A3/B4 HTHS >3.5
A5/B5 HTHS >2.9 <3.5

Fuel Economy
A3/B4 ---
A5/B5 >2.5%