I feel it is important to repeat a previously-published fact that the zinc concentration goes down with engine hours as the zinc compounds plate out on internal engine surfaces. Even if one does not change the oil, adding another slug every year might make sense. The 1,600 ppm is a starting point designed to offer protection (assumedly) for the “life” of the oil change in normal operation. Facts of life for automotive fluids: Oil and antifreeze don’t wear out but their additive/inhibitor packages do. Stationary engines as well as aircraft, railroad engine and over-the-road truck operators monitor fluid properties and add inhibitors/additives as needed or drain, flush and refill if and when needed. Fluids are also monitored for corrosion or wear materials and can provide critical information on wear or corrosion. The technology is proven but not yet offered to Chrysler 300 owners as it is more desirable from the vendor’s standpoint to just drain, dump and refill. An awful lot of used oil and antifreeze goes down the tube each year. Both can be recycled. C300K’ly, Rich Barber From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of MARK HOPKINS Hi Keith - great question for everyone in the US. When you click on the Hemmings link in your email, next click on one of the oil bottles, and a product description comes up. In each type of Hemmings Oil, the zinc content is 1627 parts per million, which is what our old cars need. Scroll down a bit, and it says the oils are manufactured for Hemmings by Champion Brands LLC in Clinton, Missouri. Nice - a product that isn't made in China, but I digress... __._,_.___ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to http://autos.groups.yahoo.com/group/Chrysler300/join and select the "Leave Group" button For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang __,_._,___ |