Hello,
as much as I have searched in sites and groups, I did not get a
specific answer as to whether a Volvo AQ271 engine, built around
1989-1990 will safely burn unleaded. Here is why:

1. volvo appendum to the owner's manual (downloaded from their site)
says this should be used on low leaded fuel.
2. mercruiser fuel reccomendation on their site, for the same block
(5.7liters, or 350 ci) suggests (if newer than 1987) unleaded without
additives.(my guess, after a lot of reading they are the same GM
blocks).

Here in Greece, lead-substitute gas is about 10% higher priced than
unleaded (normally 95+ octanes).

I am trying to find out, because I am considering buying such an engine
on a Sea Ray 250 (1990 model), but I have no access at the exact serial
number yet (boat is remotely located).

Any advice would be greatly appreciated!