Can we draw the following hypothesis from the context? 

Context:

How to check engine vacuum hoses<br>Check each hose for bulges and swelling. If a hose feels soft or spongy when you touch it, this can indicate damage caused by your car's oil. [substeps] A swollen hose that is cracked and hard is often caused by heat damage.

Hypothesis: engine vacuum hoses were introduced to cars in the 1960's
It's impossible to say