Hello, I hope someone can help me with my problem here. Auto data Volvo v70ll Built 2002, 103kw suction cup, km stand 215500. I have the following problem: under load ( while driving ) the oil control now starts after 500m and the indicator to turn off too little oil pressure engine. What was done: Tüv relevant had to be changed the cam adjustment gear (strong oil loss), here the timing belt was changed with water pump. After this work about 30km later the problem started with the Ölk oil change – error still there, new oil change with scrubbing – error still there, again oil change ( all with filter ) – error still there was now filter and oil clean. Pressure switch changed in the same time – error still there. Oil pan removed / final flow channels clean ( full oil coal ), oil channels controlled, oil trap changed (was ram to) valve from the oil filter housing as well as all O rings at the oil pan changed. Built together, in condition run over long time also ma l 10min at 3500 rpm everything is good, test drive after approx. 500m control on, car from again to everything i.o. after 500m again the same. Oil pressure switch removed, measuring clock installed – in the condition as before all i.o. oil pressure as prescribed, test drive after 500m oil pressure 0, car from again to oil pressure again there for 500m. No chips found in the tub which indicate damage to the bearings, and also no unnatural noise. Now my question: Why does the oil pressure go only after 500m load (whether cold or warm) and where can there be pump? Storage? I hope someone can help me.