Correct me if I am wrong, but ASE stands for Automotive Service Excellent. I believe it means that he has a above average knowledge on how to fix most all automotive issues that arise. You can find more info on ASE certs here:

http://www.asecert.org/

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1980 300D European
"The Red Fox"
200,000 miles

2003 Chevrolet Silverado

609 Certification