Re: [Spridgets] oil for spridgets

[Billy Zoom <billyzoom@billyzoom.com>]

http://www.carbibles.com/engineoil_bible.html

> Phosphorus (a component of ZDDP - Zinc Dialkyl-Dithio-Phosphate) is the key
> component for valve train protection in an engine and 1600ppm (parts per
> million) used to be the standard for phosphorus in engine oil. In 1996 the EPA
> forced that to be dropped to 800ppm and then more recently (2004?) to 400ppm -
> a quarter of the original spec. Valvetrains and their components are not
> especially cheap to replace and this drop in phosphorus content has been a
> problem for many engines (especially those with flat-tappet type cams). So why
> was the level dropped? Money. Next to lead, it's the second most destructive
> substance to shove through a catalytic converter. The US government mandated a
> 150,000 mile liftime on catalytic converters and the quickest way to do that
> was to drop phosphorous levels and bugger the valvetrain problem. Literally.
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