You should have no problem. EFI will do its job and unlike a 2 stroke - the
oiling should be fine. And as you said, the temp is right.
Think about how long a car engine runs at 1500 rpms on a long trip (at least
my truck runs at 1500 at 63 mph for a long time going to my parents which is
all 2 lane roads).

Tony

"Greg" wrote in message
...
Am I hurting my 60 EFI merc 4s by running at 1200-1500 RPM? I know that is
tough on a 2s. (fouled plugs, shaky lubrication etc)
I have about 35psi oil pressure, water running at the stat temp, 6-8 PSI
water
pressure, computer seems to be metering gas OK and the battery is
charging.
What else should I be worried about?