Hi all,

Need some advice. I have had my S420 for just over a year and am having indications of my first problem. The gauges seem to show a loss of oil pressure after a certain amount of time (About1 hour town driving) down to 0 at very low revsand reduces as the coolant temperature gradually rises. As yet, I have had no warning lights for either the oil or coolant and the engine is running smoothly with no loss of power. I have no clue what this could be and just pray this is not a famous Cylinder Head Gasket away on my baby.

Any help would be appreciated!!

 

slight chance it could be the oil pressure sensor, might be a cheap place to start.

 

Hi there,
what kind of OIL do you have in it? had the same problem on mine. Had 5w30 and while driving in the city the pressure was close to 0, but not during driving. changed to 10w40 is good now. The guys in germany even use 5w50 or even 0w60. But this for high speed driving :-)
W30 is better for the winter... if its very cold and W40 is better for the summer.
good luck
Andy

 

I would suggest you change the grade of oil as well.

I run only synthetic inmy vehicles & use Mobil 1 5W50 in the summer.

I would say 5W30 would be a good year round weight.

Also for summer you can always add a small amount of STP addative to increase viscosity but do not add too much.
A prefered addative would be Lucas Oil Stabilizer.

Add 100ml at a time till you see the oil pressure increase.

MAKE SURE THE OIL PRESSURE SENSOR IS WORKING CORRECTLY FIRST.

Cheers