Defender 3.5 V8 oil pump
Why would a Defender 3.5 V8 un-prime iets oil pump while park uphill during the night?
Oil level is on mark
Oil pressure is fine will driving during the day and parked on a flat surface
The Land Rover Defender (initially called the Land Rover Ninety and Land Rover One Ten) is a British four-wheel drive off-road vehicle developed from the original Land Rover Series launched in June 1948.
If the oil is pressure builds up in like a second or two it is fine! On next oil change try an OEM or a more expensive oil filter. Because in the oil filter there should be a valve. Some cheaper oil filters don’t have a proper valve or its not existent. But as long as the pressure builds up fast it should be fine!
Hope this helps! Let me know if the pressure is not building up fast.