Firstly the oil will be fine until the next 54000 mile service ,
The oil to use is Volvo castrol SLX longtec 0w/30 specification A5 B5 which is the specification that makes it suitable for 18000 miles , it wont get sludged up or anything .. ( Possibly superceeded by the same rating Castrol Edge now ) This will help well with fuel consumption .
with this engine with the Particulate filter if 2006 or later fill the oil with 5.8 litres rather than 6.4 , this is the new recommended level which is about 30% down from MAX on the dipstick ...
Dont use any other aif filter , and NEVER one you add oil to .... volvo have done a pretty good job from standard with a cold air feed ..
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My comments are only based on my opinions and vast experience .
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