Originally Posted By: alexolog
I found an open jug of Mobil-1 in my garage hidden behind some stuff.
It was sitting there for years, enduring Toronto temperatures.
Is it useable?
Thanks.
While not exactly similar fluids, I find it interesting that some blenders advocate a 5 year shelf life for engine oil sealed in a bottle, but do not object to or contradict manufacturers placing ATF into sealed transmission/transaxle units for "life-time" service, often exceeding 5 years.
I guess if it's a high-end engine worth a fortune, the cost of not using "expired" oil is incidental and worth the absolute certainty. But for the average ride or less, I'm not going to get rid of unopened top-tier synthetic oil because it's over 5 years old.
I'm running 7 and 8 year old GC in a couple of very nice engines right now.
As said above, as long as it's been kept in a well-sealed state, and the approvals and weight fits the engine and conditions, I'd use it.