Club 80-90 Forums

Sorry I can't Wiki oil as it has to be more than 3 letters

Since fitting a pressure gauge I now know that my oil is at 80 when cold then as it warms up it ticks over at 40 but as it gets hotter it drops to 30 on tick over and even 25
so would that be the type of oil or would it be the engine? The oil pump is new but the engine is not.

Sorry forgot to say 1y diesel.

No it's called hot oil.
every and any oil will get thinner as it gets hotter.
this is a good thing as your engine will be able to pump the thinner oil much faster cooling the hot surfaces and coating them with fresh cool oil
the oil temperature will reflect your coolant temp, so if that isn't working right the oil will get too hot and too thin

Mine starts at 60 psi when cold at tickover then drops to just under 20 psi when warmed up.
an oil cooler will keep the oil slightly below the coolant temp and it will remain more viscous because of that, more viscous means more psi at lower engine speeds where damage is done

So 25psi tick over when hot is acceptable Kev?

I don't know what normal is on a diesel
Mine is a petrol engine.

I just wanted to inform you that it's normal for oil pressure to drop when it gets hot.
if it was too low and likely to cause engine damage the oil light would come on when the low pressure oil switch was triggered.

My oil warning light failed that is why I got a gauge

You must know what pressure it comes on then
your low pressure/oil light switch value is the answer.

do you know what colour the switch is?

10psi at tick over is acceptable, 25psi is great. Usually the rule is 10psi for every 1k revs.

Mine currently has 5psi full stop