running up a sorn car...worried about wet exh

[steveo3002]

one of my golfs is sorn , has been for a while and its parked up in a dry garage with fresh engine oil and the battery off

i try to run it up till the fan comes on once a month, but I'm worried the exhaust will be full of condensation

any ideas how long id need to run it to make sure its fairly dry inside? had it running for 40 mins tonight , giving it a few revs and holding it above 2k for a while and the backbox never got warm at all...thing is i dunno of running it for longer is just making more consensation?

or should i roar a couple of 1/8th holes in the boxes ?

[jikovron]

starting it will fill the exhaust and cylinders with with condensation when it cools (the cause of cold start wear in the bores),,,,,,,just take of the battery and oil the bores then spin the engine on the starter every so often,,,,,it would sound terrible with holes in the silencers

[dave21478]

In my experience with unused cars - its best to leave them alone. Running the engine every now and then at best seems to do nothing, at worst, and more likely imo, will cause condensation buildups in all sorts of places, plus idling engines for long periods is known to be bad for them.