Re: update after 9k miles Chip, thank you for confirming the outstanding performance of Series 3000 Synthetic 5W-30 Heavy-Duty Diesel Oil, and that it provides the driver the security of knowing their engine is going to provide trouble-free operation mile after mile. Based on the oil analysis, it is still fit for use. Replied by Tech Admin
Re: the best multipurpose oil Hi Ryan, series 3000 HDD is a high performance, multipurpose oil, excellent for a wide range of older & off road vehicles and equipments (gas & diesel) but it is not suitable for 2007 & up diesels equipped with diesel particulate filter (use a CJ-4 spec Amsoil).
Also do not use HDD on modern vehicles that require oils with certain specs (as described by the manufacturer), which HDD may not cover. Replied by Tech Admin
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