Karl;
The following information is from a Mobil web site for Australia.
I haven't been using synthetic, but maybe I will start. It always seemed like a waste of money to change your oil every 3K or 4K and put in synthetic which is apparently, designed to last for 10K+, when the manual says to change every 7.5K for regular driving and doesn't specifically recommend synthetic for regular driving.
Info From
www.mobil.com.au/index.asp
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Mobil 1 5W50
All purpose engine oil
Recommended for Australian cars
Ideal for pre 1998 cars
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Mobil 1 10W30
Chosen by HSV to protect their cars from new (V8 and Gen III).
Recommended for latest American engines
Suitable for GM/Ford applications
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Mobil 1 0W40 Trisynthetic
Designed for high output/small capacity engines
Ideally suited to Japanese and European cars
Technology tested and proven by HRT, McLaren F1 and Porsche Le Mans race teams.
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MOBIL/Australia Recommendation for S80 T6
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www.mobil.com.au/index.asp
VOLVO
S80 T6, 2.8 Litre Turbo Eng., Automatic (1998-2001)
CRANKCASE
Mobil 1 0W-40
Capacity 7.1* Litres
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