Both
If it helps, my own car's history includes some early years (1990s/2000s) servicing by Volvo agents Riverside Motors in Doncaster
Two key services include the following wording:
Carry out 50k mile/5th year service (& 100k mile/10th year service) including scheduled replacement of the engine timing belt. That gives you the belt change interval
It also tells you that the recommended service interval is 10kmiles/annual
Riverside are still a Volvo dealer so no reason to doubt their paperwork - it is all Volvo branded
(my car had only done 10k miles in 5 years and 17.5k miles by 10 years (astonishing) but not necessarily a good thing - there are pointers to gearbox problems back then)
So gents as both of your cars are similar age vehicles to mine, I think that tells you the interval. A few other things:
1 Haynes recommend 48k/4yrs
2 Other forumers point out that you don't know the age of the belt when you buy
3 Do you buy OEM or pattern?
4 You may choose to do your belt more frequently - it's not just use that degrades it, it's also the environment. Personally, I'd not let mine go past 5 years - you need to consider the consequences of failure balanced against the relative cheapness and ease of changing the belt
Hope that helps. Nick
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