what weight of oil? maybe the oil temps are getting up there and the film is breaking down...
oil temps over about 110°C (230°F) are not unusual on warm days, but if its staying past 115°C for long periods, look into a thermostatically controlled external cooler, or try moving up to a 60 weight oil (or a good synthetic).
the factory alfa v6 clearances are just about on par with most other engines with adjustable rocker arms, so they should be fine...
my 2 cents tho...others may have other theories
oil temps over about 110°C (230°F) are not unusual on warm days, but if its staying past 115°C for long periods, look into a thermostatically controlled external cooler, or try moving up to a 60 weight oil (or a good synthetic).
the factory alfa v6 clearances are just about on par with most other engines with adjustable rocker arms, so they should be fine...
my 2 cents tho...others may have other theories