I have enough oil stashed to last me about 3 years for 2 of my cars, and about 5 for the other 2. I used to keep it in the basement, but have just moved to a MUCH nicer house, and the wife would prefer I don't keep it there. I do have a cabinet in the garage where it could go, but I don't keep the garage at an even temperature. May get to below freezing at many times in the winter, and then be warmed up to the 50's to do some work, then it will reach 90's in the summer. Will this be a problem for the oil or should I insist that it go in the basement. Some of the stash is full syn, some semi, and some conventional.