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I add 1/4 oz/gal of Optilube every time I buy fuel. At 98000 miles I have never had to replace a injector or glow plug. Are the two related? Who knows? PL says no way but circumstantial evidence says yes. My original intent was to increase the lubricity which Optilube does. If other benefits occur its a bonus.
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2009 335d
2016 VW GSW SE tsi
2008 VW rabbit (daughters car)
2004 Nissan Titan (big brakes, air springs)
1972 240Z (set up for road racing, autox)
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