30K miles on a very old (5-8ish?) isn't a good thing, a lot of buildup and deposits, dried up oil can do alot of harm. And oh yea, when I say rebuilding I mean tearing down the head, block, pistons and basically replace all the gaskets, clean up the whole head. Simple green works great. As I've thought, shops won't do those unless you pay extra. Alot of people are having problems with SRs, if you rebuild it maybe it'll be less problematic, just a suggestion.
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