The pipe on my 14 year old plus 4 with 55k miles is still like new.
It is stamped NBR/CR amongst other numbers etc.
NBR is Nitrile Butadiene Rubber which is good for up to 120 degrees.
CR is Chloroprene Rubber (neoprene) which is good for up to 140 degrees.
So the hose is a blend of the two with NBR giving resistance to oil, fuel, abrasion and high temps.
The CR adds resistance to weather, ozone and temperature stability.
