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Is it wise to change oil and differential fluids before the winter when car is just put away from oct to march or do the change when car is put on road for spring and summer?
well I don't actually know if 9 out of 10 doctors change their fluids before the winters storage prep but most mechanics and all the manuals I've ever read say so.
Take engine oil; the acids and carbon, ect from the combustion process would just sit there etching away at all the metals
Oxidation itself particulary with the ethanol in the fuel can harm engines, not as much anymore . But fuel dilution to the engine oil leaves water moisture ( ethanol) lying in your crankcase
I change all my vehicles oil before the winter storage , most don't see 3000 mile annually but it cheap insurance.