ME & MY CAR
By JONATHAN WELSH

Is the New Low-Sulfur Diesel
Bad for Older Engines
December 12, 2006; Page D12
Q: I have heard that the soon to be EPA-mandated ultra-low sulfur diesel is bad for my 2006 Jetta TDI. Is this true? What about older TDI's such as a 2003 and a 2001? I would appreciate your advice.
-- Hart Renger,
Fort Collins, Colo.

A: It's a myth. I have heard similar theories, mostly pointing to the relationship between higher sulfur content and favorable lubricating properties that are vital to engine longevity. However, the new lower-sulfur fuels maintain lubricity similar to earlier formulations and can be used safely in older diesel models -- not just Volkswagens. Indeed, according to Mercedes-Benz and a newsletter for a Volkswagen TDI owners club, the older engines will log slightly better fuel economy using the new fuel.

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