to h20 diesel and anyone else; re reading your post i see that according to the benz 126 cd the oil pressure relief does not begin to open until system presure reaches 7 bar ? thats 105 psi ? assumeing thats not a typo graphical error then i am barking up the wrong tree here and there is no problem with this system at all , it just had a bad oil pressure sending unit ..... and i am chaseing my tail, incorrectly assumeing this system to be the same as other systems i have worked on , and assumeing benz engineers think the masses dont need to know their actual oil pressure as long as its above 3 bar dont worry about it , they could have used a vw type system with 2 oil pressure switches 1 for high rpm and pressure 1 for low rpm and pressure ,
well ive barked up the wrong tree before , its better that i learn my mistake now before i waste more time chaseing down a non-problem , thanks for the tip , please confirm its not a typo thanks again mike webb