From: "webmaster" <stephen844@xxxxxxxx>
Subject: IML: What is the best oil to use in a 100,000 mile '59 413 ?
I now realize that the problems I have encountered are from changing the
 oil on my car.  I used a 10w-40w detergent oil and it has gummed up the
 hydraulic lifters on my car, bending push rods etc.
 After having the heads/valves done the culprit was stuck lifters.  In 
order
 to not do further damage I will probably use a non-detergent oil which
 is what was probably there in the first place.  My concern is that 
keeping
a detergent oil inside will only continue to put the grime back into it 
and
cause further problems.
What oil grade should I use for summer driving?  This is the only time I
 use this car.