The handbooks are what volvo stated for the engine at time of manufacture, that is what is correct, what may be happening now doesnt apply to back then. The latest oils can kill an old engine.
Sometimes ignorant dealers dont understand this and recommend the wrong thing (often tbh)
Sometimes manufacturers claim to have 'backward compatibility' but this in reality only spans back a handful of years. Take vauxhall dexos 2, its supposed to be fully backwards compatible with all preceding requirements, but in reality this only works back to the early '00's, you cant run a dexos 2 oil in say a 1988 cavalier, or even a lot of 1998 stuff as it wont sufficiently protect the engine, and you certainly cant put it in a 1968 victor!
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