not sure where everyone is getting this info that oil needs to be changed every year... or especially that "most conventional oils have a shelf life of a couple years"... that is 100% untrue!
oil does not expire after a couple years on the shelf or in your oil pan. please do some actual research before posting false info like this. call any major oil company & ask that question, or any reputable machine shop or engine builder, or check out bobistheoilguy forum, they will tell you oil has an almost indefinite shelf life if stored in good conditions, the oil doesnt go bad & the additives dont expire. worst case is the additives may settle a little & if that happens simply shaking the bottle will mix them back up.
as for oil already in the engine, same as on the shelf, its does not just expire sitting there. as long as you do full warm ups when driving & not just 5 or 10 minute trips in the cold temps, the oil is burning off any impurities like condensation or fuel & the additives are neutralizing any acids or combustion byproducts.
i own 3 classic muscle cars & they get driven very little, maybe 500-1000 a year sometimes, i leave the oil in them for at least 2-3 years, longer if the total miles are below about 1500 & the engines are doing perfectly fine & when i do drain the oil it looks almost like new & i usually use it for another season in my lawn mower.
bottom line is that oil doesnt just go bad from sitting or from low miles. keep in mind oil companies & most mechanics are just trying to sell you oil or oil change service, rarely will they speak the truth on anything if it means $$$ in their pocket.
to the OP, save your money if you have low miles on the oil, especially if its a quality synthetic, 2000 miles or 1-2 years does not need to be changed! if you got roughly half the change interval miles, say 2500-3000 & its been ~2 years then maybe, but i guarantee if you sent a sample for analysis it would come back as perfectly fine & has many miles left.
heres a direct quote from valvoline: i suggest reading their or other companies FAQ's or call their tech line for actual facts on the matter, not just random uneducated opinions on a forum.
GENERAL MOTOR OIL FAQ
Does motor oil expire? If not, how long does motor oil generally last?
Valvoline motor oils do not have documented expiration dates. When stored under optimal conditions, the product remains stable for an extended period of time. It can be used as long as the American Petroleum Institute (API) rating on the label continues to meet or exceed the requirements listed in your car’s owner's manual. If the rating is still current, we advise you shake the container before use to blend any additives that may have settled.
