I've had mixed results with diesel purge. I've seen old diesel that have sat for a while, run a lot smoother after a purge, but I've also experienced no change. You're definitely not hurting anything, and you are definitely cleaning off any deposits that may have started to gather.
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Andrew '04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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