[Familyman 90]

There are other Volvo models, such as the P3 V70, where the more powerful 5 cylinder oil burners were called D5 and the least powerful variant the 2.4D.

But not on the XC90, where they were all badged as D5. The V5 log book will stated "D5" on the 163, "D5 185" or "D5 200", but the badge on the boot is always D5, barring the changeover year to the 185 where some 163s were badged as 2.4D...but there are very, very few. There were none badged as 2.4D in other years.

It orignally did mean diesel, 5 cylinder - Volvos own launch literature said as much. Of course this went out the window about 10 years ago when D4 and D3 were used to designate the small bore, lower output diesels (still excellent units, BTW).

But as far as the MK1 XC90s goes its easy - if its 5 cyclinder and rattles a bit on start up then its a D5, and regardless of the boot badge will stste D5,on the V5.