I spent time looking at the various additives and I have been using OptiLube for about 6 months now. I am concerned about the bio diesel I occasionally get and I want to keep the injectors I just replaced clean. I use the XPD. I have a 2004 Cat C7.
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Originally, I started using OptiLube years ago for the lubricity, especially after they came out with ULSD. Biodiesel is now another good reason to use it. Many stations are selling 20% biodiesel.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor