Thanks, crew, for the various replies. Thirty thousand (30,000) miles being mentioned, I seem to recall that my wife's S2000 is set at the same replacement recommendation interval. Additionally, the "common sense" (something sorely lacking in many quarters these days) suggestions about environment I sort of figured out myself. The "checking it" is a little much for an old-timer like me UNLESS I am routing around in the engine compartment for more serious issues...but again, thanks for the suggestion.

Disney