IIRC some of that stuff was more like 50 years old. There were no signs of age related deterioration.I read an article from Blackstone labs where they used and then tested some oil that was 20+ years old! It still tested as good as new!
My dad had some old Quaker State in an unopened can we found in the back of the garage when they were moving. No telling how old it was. Looked just fine...used it in the lawnmower, but wouldn't put it in my carIIRC some of that stuff was more like 50 years old. There were no signs of age related deterioration.
They tested the oil in the lab and it was just fine and one person is running it in his 1980s Chevy pickup.Looked just fine...used it in the lawnmower, but wouldn't put it in my car
Ha, running a John Deere from 1990 - still remember buying it; dad replaced his with a self-propelled Honda. Deere smokes a bit, but couldn't complain about it otherwise - 21 years for a piece of yard equipment is fantastic in my book - it usually just got whatever conventional oil was on the shelf in the garage.Been using synthetics in my air cooled back breaking toys as I call them for years. If anything requires synthetics, its an air cooled engine.
They last years longer.