Find the leak and fix it.
you will probably need to change heads gaskets
I have an 83 aircooled vanagon camper...so far it has been very reliable. Just remember to check/change oil and take care of it.
4.8 quarts after a filter change.
You can not disable it.
Add oil. For God's sake add oil before you blow the damm thing up!
check your book that came with the van...i used 20-50 during the summer time...
Low oil pressure. Can be a defective oil pump or the oil pressure sending unit is defective. Start by replacing the oil pressure sending unit.
You can not disable it. You have to fix whatever is causing it to go off.
dirty sensor
You don't, get the unit serviced and if required repaired.
A 1986 Jeep Wrangler needs 6 quarts of oil for an oil change.
The oil capacity for a 1986 BMW 325 is 4.3 quarts.