I usually keep an extra quart of oil with my spare tire just in case but haven't used it in quite a while. I just noticed it the other day and wondered how long it can hang there and still be good. It's synthethic so I expect it's a pretty long time but would love to hear if anyone knows the actual shelf life. Thanks.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold