I have actually been researching this today as I have some due,
Ok Cessna hoses I would count as ones in the Cessna Manual under the aircraft and with a Cessna Part number or alternate, I have never had an O-235 back from overhaul with any hoses fitted as Lycoming do not supply them with them, and I have had a lot of Lycoming supplied engines.
This is where it all gets a bit Cessnaesque and totally unhelpful.
The Cessna 152 manual states (1978 through 1985) ( ITEM 2)
However the Cessna 100 series manual (1963-1963 )amended 2003 gives
Now although the 152 one only refers to rubber hoses, the latter for the earlier version of the aircraft under the 100 series refers specifically to the Teflon as well, So to be on the safe side I use the latter more stricter limits as the Cessna 152 stand alone manual does not mention Teflon hoses. You could read it as the 152 manual only gives a life on rubber hoses, therefore the Teflon ones are on condition...
So Cessna give you two different standards......... how unusual.
