Losing oil pressure when running hot

I've got an ´85 280SE (w126 european model) with a injection 110 engine with oil cooler.

When the engine is hot it has low oil pressure on idle. That is - below 1 on the meter.

Yesterday it totally lost pressure (almost 0 on the meter) when idling after doing some kickdowns on a hot engine on my way home.

I usually drive very short trips. So it almost never runs hot. I checked the oil after the trip yesterday - but it seems it does not burn the oil.

I have 15w40 oil on it (less than 1000 miles "old")(I used to have 10w40 but changed to see if a thicker oil would do better - was that a bad idea?).

It idles around 600-700rpm in drive position, and a little more in park or neutral prosition. The engine has an unknown milage - probably around 300-400 kkm. It has a renewed head from two years ago.

What could be the culprit? Worn Crankshaft? Oil Cooler? General old age....

I'm not too nervous because it usually has enough oil pressure. Should I be worried?

Best Gunnar

Reply to
Gunnar Langemark
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I had this same problem and it was the thermostat.

Reply to
Ben

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