Hi Steve,
I really think I'd stay away from non-detergent
oils. I've always used detergent oil in my '60 and I'm 99% sure that the
MS requirement for oil in the Owner's Manual denotes detergent oil
standards. By using non-detergent, especially with the type of use we tend
to subject our cars to, one runs the high risk of sludge formation which
will almost guarantee the problems you describe in the long run. Frequent
oil/filter changes with detergent oil are the only sure fire way to prevent
sludge and grime build up.
I change my oil and filter every three months even in
the winter when the cars see little use.
As for oil grade - if you go single viscosity a good 30w
should do you fine for summer driving; 20w-50 if you prefer multi-vis to defer
to the engine's mileage. I use Valvoline Max Life in my "senior" cars
which is especially formulated for higher mileage engines and I've been very
pleased with it.
Good Luck -
Jim L. in OR
'60 Crown 4dr Southampton '62 Crown 4dr Southampton
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