I'm not trying to bust your nuts here or anyting but exactly what does that oil sitting at the bottom of the pan do to the motor while it's it's all winter? I'm saying this because literally I don't change my oil till I can afford to the next spring.. LOL
Acid contaminants float to the top and sit there and chemically attack any metal at that level. Read any manual for winter or long term engine storage, change oil and filter is always in there.
