Originally Posted by hamdave
I've been told by my 'GM' mechanic to run the engine at least 30-40 min once every couple of months. I park mine in my garage and I really don't have the option of pulling it out and driving during winter. I just open both garage doors and let it run, genny also.
YUP - many of us really don't have an option to actually DRIVE the MH or other stored vehicles in Winter months - they may be "mothballed", under cover - and/or roads are impossible or impractical with ice and snow covered roads.
BUT - at least in the case I described with an engine sitting idle in what was a relatively mild Sacramento area climate, condensation can easily be a serious issue in engines and similar larger assemblies left idle for months in unheated areas - bad enough in a vehicle worth only a couple of thousand dollars - catastrophe in one worth many 10's of thousands of dollars!
And sure, the internal rust, corrosion and pitting of internal parts might NOT be immediately evident the next Spring - or the one after that - but they most certainly DO add up over the longer haul and time period, and SOMEONE *WILL* eventually be paying the price for accelerated wear and damage!
Longer periods of idleness prematurely kills engines and drivetrains, just as it does people - starting an engine and running it for reasonably extended time periods in place isn't
the best solution - but may be the ONLY one available to many folks, and it is FAR better than not running it at all as a tool to periodically circulate internal lubricants to keep internal castings, cylinder walls and related components re coated with a protecting oil layer - and to simply dismiss this approach as improper, imperfect and unnecessary, leaves the door open to potential mechanical problems - maybe later - but MAYBE sooner!