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Old November 9th, 2019, 20:24   #10
Veteran Member

I’ll continue to have my dealer do the oil changes through the 160K for warranty purposes. If something goes wrong I don’t want to give them any reason to decline the repair.

DEF crystallizes when exposed to air, the crystals seem to be what causes issues with level sensors and pumps. I advocate keeping the DEF tank full and topping it off before it gets to 1/2 rather than letting it get low.

DEF does have a shelf life of about 2 years, as such I wish the tank had a drain on it so I could start fresh once in a while without running the tank to empty. I’m driving about 20K miles annually, so I burn through it quickly enough.
My Commuter: 2015 Passat TDI SE 6MT, Wife’s Driver: 2015 Touareg TDI Lux

Former TDI’s: 2009 Jetta TDI - traded 09/2013, 2011 Touareg TDI - Bought back 2/26/2018
My Truck: 2006 Dodge 2500 4x4 Cummins
Wheelin Rig: 1987 Ford Bronco

Last edited by BroncoAZ; November 10th, 2019 at 09:30.
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