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AndyV7o · Jul 19th, 2018, 20:32

Check here https://www.volvoforums.org.uk/showthread.php?t=283503
If the manufacturer states B4 that is what should be used, B5 should only be used in engines which were intended to use it. I think the confusion arises in that all the other variants (of the same age) use A5/B5 and only the D5 uses A3/B4, whilst the euro 4 D5 uses A5/B5 inline with the rest of the range. It would follow logic that there is a reason the D5 was singled out to use a different spec than the rest of the range, and that during the euro 4 revision something(s) was(were) altered to use B5 safely where it wasnt suitable before.
A3/B4 and A5/B5 are not sequential specs but seperate (the link will explain)

Jul 19th, 2018, 20:32	#15
AndyV7o Premier Member Last Online: Jun 21st, 2021 20:47 Join Date: Jun 2018 Location: Creswell	Check here https://www.volvoforums.org.uk/showthread.php?t=283503 If the manufacturer states B4 that is what should be used, B5 should only be used in engines which were intended to use it. I think the confusion arises in that all the other variants (of the same age) use A5/B5 and only the D5 uses A3/B4, whilst the euro 4 D5 uses A5/B5 inline with the rest of the range. It would follow logic that there is a reason the D5 was singled out to use a different spec than the rest of the range, and that during the euro 4 revision something(s) was(were) altered to use B5 safely where it wasnt suitable before. A3/B4 and A5/B5 are not sequential specs but seperate (the link will explain)