You have to expect aged hoses to deteriorate. It is wise to carefully inspect every hose on the car. Rubber rots with ozone and heat over time or hardens to the point of low flexability. Seepage results or worse.

If you feel the oil cooler hoses are original try to get a pair of reciently replaced ones off a wreck or buy a pair. Another choice is to have a hydralic shop install your ends on new hose.

The rational is if one fails usually it will cause total destruction of the engine. Even if the destruction is avoided the resultant down time towing costs etc will be far greater than dealing with the hoses. Besides the cost then the event is not going to occur. I always seem to loose a days time with almost any auto issue that disables the car. It can even be far worse depending on where you are and how far from home.

Check your brake hoses for being hard as a rock and cracked. They are designed for six safe years with a maximum af ten years usage. After that becomes a crap shoot.

We are dealing with cars that have consumable parts far older that their designed lifespan present if not already changed out. Cooling hose are another area as well to investigate. all these things affect reliability to some extent as well. I like reliable cars rather than rolling dice. All the belts on the engine are in a simular catagory. Avoid downtime by preventative strikes. Mentally it usually makes you feel better about your car anyways.