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The Feds set the standards for what can be labeled and sold as "DEF". It isn't too complex of a formula. I buy what ever I find, preferably at the cheapest price. I am over 100K miles now and no troubles with the DEF system.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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