WHats this valve clatter you speak of?

I can't hear it over the knock of my Diesel vanagon..

When I acquired my AC model camper, it had a terrible lifter clatter.
I used some Seafoam brand cleaner (available @ NAPA) in the crankcase
and then a fresh batch of 20-50 oil.
though for summer I've gone back to straight 30. Diesel duty
rated(extra detergents-thats why it's soo dirty looking, more stuff held
in suspension on Diesel service oils)

Dan
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Infrequent or long periods of not drivng the vehicle is almost a
guarantee of the lifters going flat and having valve clatter on
start-up.