A few years ago I bought some Mobil 1 5W-30 ESP for my previous "d".On the bottles was an expiration date which,IIRC,was about four years after I bought them.Do high quality synthetic oils like Mobil 1 and Fuchs actually have a limited "shelf life"? I ask because I've got about 12 litres of Fuchs (LL-04/229.51) oil that I've had for 2-3 years and I hope to be able to use at least some of it over the next couple of years in my new "d".TIA to anyone who replies!