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Oil viscoscity makes a lot of difference. When I first got my 16v, I used 5w/50 oil - that made the oil pressure settle at about 1.5 bar at idle and made the oil temperature much higher than normal (settled at about 120degC). Now, in my enlightened state, I use 10w/40 - the pressure at idle is about 0.5 bar and the temperature on a long journey now settles at about 100degC. Much better!
Renault recommend oil viscoscities for a good reason!