easiest way to check all hoses for leaks? any treatments to prolong their life? M119

[ProV1]

I want to make sure all the air/vacuum/breather hoses on my M119 engine are intact. is the easiest way to get a can of carb cleaner and spray all along the hoses while the car is running?

also, are there any products to prolong the life of the hoses? thanks

[compress ignite]

Suction hoses tested with a "Mighty Vac" or equivalent.(do a "Search"...model
specific)
Fuel lines ---visual inspection.
Engine coolant system/cabin heat/oil cooler... pressure test with anti-freeze
pressure tester.

Depending on the chemical composition of the individual hoses (nitrile , Etc.)
[Good luck on getting that information without a LOT of research]. There
may or may not be any life expectancy extender.

[pcmaher]

Whatever you decide to use on the rubber, do NOT use anything with silicone it it. That could get into the wrong places and contaminate (ruin $$$) your O2 sensors.