http://www.fourwheeler.com/how-to/engine/1608-5-things-to-help-combat-and-cure-a-cold-cummins/
http://www.royalpurpleconsumer.com/wp-content/uploads/PS_HPS_Motor_OIl.pdf
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http://www.royalpurpleconsumer.com/wp-content/uploads/PS_HPS_Motor_OIl.pdf
No approvals...
No certifications...
No recommendations...