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When a diesel engine loses high end/max RPM, that's when the filter flow is very restricted and needs immediate changing. There's no need to waste money on that fuel gizmo, just watch the RPM's. An "air cleaner restriction gauge" tapped into the intake manifold on the other hand is very useful. You can get those at any heavy truck dealer.
OTOH, Preventative Maintanence is another story, change the filters in the spring or spring and fall if you cruise a lot yr. round and most filters will be fine for the duration.
I've been working on heavy diesels (and everything else...) since 1973 and have seen many gadgets that are useless...
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Ken, East Prov., R.I. Bootlegger, PY26 Paceship
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