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The lead substitute treatments (for old British classics eg) usually are based on Sodium or Potassium. No need to use either on an air-cooled VW anyway. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ----- Original Message ----- From: "Jim Adney" <jadney@vwtype3.org> To: <type3@vwtype3.org> Sent: Tuesday, December 07, 2004 10:42 PM Subject: Re:[T3]Carby Backfire > On 8 Dec 2004 at 9:03, Steven Cooper wrote: > > > I am using premium unleaded fuel (98RON) with an upper valve lubricant > > additive. We can no longer get leaded fuel in Australia > > It's the lead that causes fouling, so fouling is extremely uncommon with > unleaded gas. OTOH, if your additive has lead in it, it may be the problem. > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~