I want to say the interval is 10k miles for fuel filters, but it also hinges on whether you need new ones or not. If you get clogged before that, obviously you're going to have to change them. Keep and eye on the prefilter, and if it's looks like a majority of the filter inside is getting gummed up, I'd change the filters. Generally I look at mine everytime I change the oil.
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Andrew '04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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