3208 service intervals

[birdshill123]

I am wondering what others are using for service intervlas on a 3208
Turbo intercooled. I have the factory engine guide and it is really
geared to industrial users. For instance the oil is to be changed every
3 months or sooner according to engine hours. Most of us do not log 300
hours (about 12000 miles) in a 3 month period. Today's manuals for RV
engines take this into account and have a more reasonable requirement.
I realize the 3208 is not today's technology and extended intervals
would not work. I was thinking of every 6 months or 5000 miles. Anyone
concur? if not what would you suggest and why? Coolant changes are even
worse. Cat suggests every year at minimum.

Bruce FC35 1988