A stab in the dark...
...do any of you use a thermal/antifreeze cover on your car battery? Is it an OEM or aftermarket add on...does it do the job?
My MK4 TDI came with a sleeve type thing which fits nicely around all four sides, but nothing covers the top. Temps over here get down around and sometimes below minus 20C and as I've not long fitted a new (and expensive) battery, I'd like to give it a chance of lasting.
This query is not model specific...it's all about the battery, not the car.
Anyone care to comment?