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Post Info TOPIC: Flushing Oil Concentrate


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Posts: 4595
Flushing Oil Concentrate

We have 4.2 lt Nissan Patrol TDI, towing 3.5t van.  Like many patrol drivers, we have overheating issue when towing up long steep inclines.  This problem can be conquered by keeping the revs close to 3000 RPM, but at times, this is not possible, hence my question:

Does anybody have any comments positive or negative about the additive "CEM FOC (Flushing Oil Concentrate)" or similar?

Does it decrease the need to have the injectors serviced?


Pay it forward - what goes around comes around

DUNMOWIN is in Bright, Victoria for the next twelve months (at least til early 2019)


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Posts: 1688

I am a non believer in all those additives, Take your injector question, when an injector fails they general get a leaking nozzle and poor atomisation of the fuel. The dripping nozzle is caused by a worn seat (very simular to a valve seat in the head of the engine), the only way to fix this is to regrind the seat to create a perfect seal again. Poor atomisation is caused by low injector crack off pressure (this is the pressure created by the fuel pump to crack open the seat to allow fuel to flow), the fix for this is to wind more pressure onto the spring that holds the seat shut. So there is no way any additive is going to make an ounce of difference to either of these common problem with an injestor. My recommendation for bad injectors is to fit new tips and have the pressures reset. I can give you a simular explanation to any where you would like to put an additive to why I would never use them.

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