Quote:
Originally Posted by Tannaton
I believe AW-1 is a slightly lower viscosity fluid and the main reason for the change is economy reasons.
From MY12 Volvo switched from JWS3309 to AW-1 for all models except XC90.
The information already supplied gives you a number of good options, but there is no harm in using either so long as a full flush is done.
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Do you think 12 liters of oil enough for a full flush? It's 3 drain-fill.
Regarding the viscosity of the oils:
The Volvo OEM oil (31256774):
viscosity @ 40C: 25.1
viscosity @ 100C: 5.6
viscosity index: 174
Tested by a russian company:
https://www.drive2.com/o/b/482952512115049038?page=0
Aisin ATF6+ FE (JWS 3324/Toyota-WS):
viscosity @ 40C: 29.6
viscosity @ 100C: 5.9
viscosity index: 149
As far as I know now my box filled with the volvo OEM and I'm afraid a little bit of mixing the two oils due to the three time flush procedure is changes "only" the 75-80% of the old oil.