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Date: Fri, 18 Mar 2005 23:12:36 GMT
From: Retroed Bob <uctraingNOSPAMOnospamanet.com>
Subject: Re: anti freeze


On Fri, 18 Mar 2005 18:11:40 -0000, Mac Townsend <mactnonospamadcomgraphics.com> wrote: >Thanks, Fred. > >I had a chat with the folks at the shop where my head gasket is >currently being replaced <sigh> > >There is some difference of opionion between Toyota/Japanese Mfrs and >the Euro Mfgrs. Toyota seems less concerned about phospates but inisits >on low silicates while Euto wants minimal phosphates and doesn't care as >much about silicates. They stock BMW and Mercedes brands, but suggested >looking for the proper (low phosphate) Zerex or Quaker State at AutoZone/ >whatever ...and thanks to your missive (and those of others), I will >know a little better exactly what to look for. First, some background: in the 70's prestone invented the high silicate" type of green stuff. Silicates help prevent corrosion. It was considered a major advance in that area. However, silicates also cause wear (silicates are abrasives). Japanese cars are famous for wearing out water pumps. Many feel that the silicates in some antifreezes are the culprit. I've seen some evidence but nothing clinical. It may be Japanese manufacturing that creates water pumps that wear easily, I don't know. I do know that Nissan and Japanese dealers are stringent on the requirements for non silicate AF. European manufacturers worry more about phosphates. They don't seem to have the Japanese water pump problems. I can't say why. I've also heard that European water supplies are more likely to be higher in minerals that add to the phosphate problem, but I have no real info on that. Could just be rumor. Whatever, all the Euro manufacturers worry about phosphates and _low_, not _no_ silicates. Zerex (G05) is low phosphate, low (not "no") silicate.

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