I credit bad motor mounts with breaking the upper rad. neck on my '88 SL. Hose is tight and when engine starts to move around, it puts a lot of strain on the neck. If it is old and brittle like mine was (plus P.O. had used green antifreeze!), then it can break pretty easily. Motor mounts did not have many miles on them when they let go, but did have 10 years.
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