In 17 years of research and testing we have never found any type of fuel or oil additive that improves either the fuel or oil system. The PRV-6 asks for nothing except recommended oil changes; save your money. "We're here to help you" DMC Joe / De Lorean Services / <dmcjoe@xxxx> Web Site: <www.deloreanservices.com> . ----- Original Message ----- From: Brian McCool <bjmccool@xxxx> To: <dmcnews@xxxxxxxxxxx> Sent: Monday, July 03, 2000 11:26 AM Subject: RE: [DML] lock / window failure prevention > There is an additive I keep seeing advertised in an infomercial called > Z-max,