Posted by Ark68SS on February 14, 2014 at 19:49:45 from (172.13.141.252):
In Reply to: Zinc Content in Oil posted by DelMN on February 14, 2014 at 11:17:53:
Zinc can damage catalytic converters. For that reason, the EPA has mandated that zinc levels be reduced in today's oils. Most, if not all, modern automotive and truck engines are using overhead camshafts or roller lifters. These motors don't require a lot of zinc because the loads on the cams and lifters aren't as great as those in flat lifter motors. Believe it or not, the small area of contact between a tappet and camshaft is the largest amount of pressure seen in most engines, even greater than the pressure at the crankshaft bearings.
Zinc is one of the additives in oil that counteracts extreme pressure loads, like those found at the camshaft/lifter interface on older, flat-tappet engines. These loads are at their greatest during the initial break-in of new cams and lifters, and the damage begins at that time. Cams and lifters are surface hardened only, and once the hardened surface is worn away, it's just a short while before the rest of the contact area is destroyed. This problem is exacerbated by high valve spring pressures and high lift camshafts used in performance applications.
Old tractors and old cars aren't a very big part of the oil makers' market, but some of them are beginning to realize that they need to address this group of folks. That's why you're starting to see oils made for the older stuff.
My personal experience, mostly with GM products from the mid 60's, is to use the high zinc content oils at break-in, then it's OK to use a modern oil, as long as the engine doesn't have higher than stock valve lift or spring pressures.
Here's a great Internet site with all you need to know about oil-
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