The new synthetic oil is very different then the old dyno oil we used to use. Its far more forgiving over time, as far as inhibiting engine corrosion, maintaining its viscosity longer, holds particulate matter in suspension far better and longer and is more resilient to very high and very low temperatures. I do run mine a year, usually changing it sometime before the hot summer season starts. Having said that, if I drove more miles, I would change it around 10K, just for insurance. An oil change is one heck of a lot less expensive than an engine replacement, or even repair.
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