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These have to be the best 4oz empty plastic bottles out there. High performance quality and they match the XPD product line perfectly. I swear they added 2-3 hp to my 2001 Dodge Ram 2500 Cummins as soon as I started using these in place of the no name brand empty plastic bottles. Highly recommended.
Currently mixing boost and xpd with great results. I feel i did not need as much lubrication as xpd brings alone and boost uses less additive per gallon for $$ savings. Kind of my idea of POWERSERVICE PLUS CETANE BOOSTER, but with higher quality XPD PLUS BOOST. I do average mpg slightly higher with just xpd but the mixture gives me quicker detonation during injection (performance) and more of a jerk during downshift acceleration (faster response) . Application is N57 BMW diesel.
Awesome product. Recently purchased a TDI Touareg and I must say this stuff made my engine quieter. It used to have this weird clicking noise but it doesn't have that anymore. I am quite impressed with this additive.
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