No ford 6 cyls have gear drive lots of big diesel engines have gear drives .Engines that turn over 7,600 are hard on oil. To convert to a gear drive from a chain drive is a waste of money plus engineers in the know state gear drives may accelerate cam and valve train wear due to the harmonics ,cam chains and belts don't transfer the harmonics as well.Heat kills the oil.
[ April 14, 2003, 04:59 PM: Message edited by: Steve S ]
Ken2, yes on how the cams are driven I used to have a 1988 4 cyl Camry when new I did oil samples for the first 4 years using amsoil.The oil samples were never was bad they ran about 7,500 to 13,000 miles. The problem has to be a combination of things as there seems to be many d o h c engines that don't waste their oil just an opinion and we all know about opinions.