Interesting - so in '99 they didn't have ELC yet? Given that the CAT ELC is stupid expensive, was wondering if anyone is running the Chevron Delo product, which on the surface seems to meet the same specs. I'd get the CAT if there was a dealership in ridgecrest, but at least 90 miles to one. And suppliers online are charging $18/gal for shipping the cat product, free with prime for most everything else.