codyayrton
Veteran Member
- Joined
- Jun 16, 2014
- Location
- Bend, Oregon
- TDI
- 2011 Jetta Sportwagen TDI 6M (sold to VW), 2015 Golf S Sportwagen TDI 6M
Why totally fill the DEF?
During my 10,000 mile services, I opted not to totally fill the DEF. Instead I added one gallon of AdBlue. I then checked fill level with VCDS. It indicated 80.18%. Each half-gallon bottle increased fill level by 9.23%. This indicates about a 5.4 gallon capacity. The owner’s manual says, “about 4 gallons.” If we can assume that the vehicle’s DEF tank was completely full 10,000 miles ago, that calculates to about 2 gallons per 10,000 miles. For future services, I plan to buy Peak BlueDEF from WalMart which comes in a 2.5-gallon container and is much cheaper. I also plan to wait until the tank is nearly empty to minimize carrying the extra weight and have fresher DEF. The vehicle should alert us when there is only about 1500 miles worth left. The VW owner’s manual says any DEF that conforms to ISO 22241-1 is okay. BlueDEF claims to meet this requirement.
During my 10,000 mile services, I opted not to totally fill the DEF. Instead I added one gallon of AdBlue. I then checked fill level with VCDS. It indicated 80.18%. Each half-gallon bottle increased fill level by 9.23%. This indicates about a 5.4 gallon capacity. The owner’s manual says, “about 4 gallons.” If we can assume that the vehicle’s DEF tank was completely full 10,000 miles ago, that calculates to about 2 gallons per 10,000 miles. For future services, I plan to buy Peak BlueDEF from WalMart which comes in a 2.5-gallon container and is much cheaper. I also plan to wait until the tank is nearly empty to minimize carrying the extra weight and have fresher DEF. The vehicle should alert us when there is only about 1500 miles worth left. The VW owner’s manual says any DEF that conforms to ISO 22241-1 is okay. BlueDEF claims to meet this requirement.
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