I have a weekend toy that I only do a few thousand miles a year in .I always change the oil and filter in the spring .It seems a waste of Mobil 1 .
Synthetic oil is not only refined but also distilled, purified and broken down into its basic molecules. This process not only removes more impurities from the crude oil but also enables individual molecules in the oil to be tailored to the demands of modern engines.
Longer Lasting AMSOIL Signature Series SAE 5W-30 Synthetic Motor Oil. Extreme heat hastens chemical breakdown (oxidation), altering the oil's chemistry .
Synthetic oil doesn't break down by just sitting for a year, unless the car is. While oil itself doesn't break down from just sitting, it does become .