Last October I purchased a 2010 Subaru Forester. After my first 3,600 mile checkup the dealer told me that I would not have to come back for an oil change for another 7,500 miles because they put in a synthetic/petrolium oil. This was good news as I'm used to changing the oil every 3,000 miles. I'm now into about 4,000 miles of the 7,500 sinthetic oil change and I'm getting emails from the dealer saying that it's 5 months since my last service and should make an appointment to service my subaru - for an oil change.
My question: Is the synthetic oil going to be good for 7,500 miles or does it have an experation date?