2007 XC70:No whistling sound, is it possible to still have a failed or failing PCV?

[AylmerQc]

A garage mechanic who worked on my recently bought 2007 XC70/2.5l petrol engine (for the previous owner) told me it needs the pcv replaced.
I have some oil around the outside of the oil filler cap and at the joint of the large black (intercooler?) pipe down by the radiator.
Watched a video where the guy does a test with a vinyl glove and I did the same. The glove didn't get sucked it but got slightly filled.
I spoke to another mechanic over the phone about doing the pcv replacement and he said if the pcv needs replacing there will be a high pitch whistle sound, but the engine on this car doesn't make or produce this sound...
What do you think? Could it still need a pcv job without the whistling sound just from the the telltale oil and glove test?

[jonesg]

yes, it needs doing, leave the dipstick loose to prevent pressure build up for now,
otherwise you can blow the crank seals out and be in for more work.
its a diy job , tedious but diy.