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The majority of DEF is made overseas.
The US is number 4 on the list.
I work part time for one of the largest nationwide auto parts retailers, and we stock DEF in 2.5 gallon jugs.
Supply has been spotty for several months now. We have run out, and been unable to get more, on several occasions in the last 4 or 5 months.

Also - availability of heavy duty engine oil for diesel trucks has been very hit or miss as well. Shell Rotella, Chevron Delo, etc. My wife drives a diesel Chevy Silverado 2500 Heavy Duty pickup, and I have backstocked enough oil and filters for her truck for maybe two years worth of driving.
I'm getting ready to do the same for my GMC Sierra 1500.

When the big trucks stop, the whole country will stop. Many independents are already parking their rigs due to high diesel fuel prices. The average semi gets about 6 MPG, and diesel is almost $6/gallon now.
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