Very low oil pressure when hot - a worry?

[Ben Nichols 1979]

Hi

I have a willy 3 with around 105k miles on the clock. Now, when the engine is cold the oil pressure is circa 4 bar on idle rising to 5.5 - 6. I was stuck in traffic for about 30 minutes after a drive (not a particularly spirited one!) and the oil pressure gradually fell off the scale. Its still high when cold so I don't think there is a pressure probem per se but obviously when its hot its very very low.

I looked at the oil when it was hot and it was so thin - almost like water. I assume the oil needs to be a bit thicker but not sure what to put in. Does anyone know of a thicker oil that is used and if so what is it? has anyone else had this porblem?

Thanks

Ben

[Coops]

dash gauges are usually crap, they get worse with age

correct oil is 15w-40 semi synth

and if it hasnt blown up yet, its probably okay ;-) if your genuinely worried, get a mechanical test guage on it and check the pressures properly :-)

[Markic]

If there is no oil pressure light coming on it's all good.
Oem dials are really crap, senders too tbh.

[RB23]

Has anyone got any experiance of after market gauges??

[Markic]

Get VDO one. They are very good.