Change it at 3500-3750, check it between oil changes and top it off as needed.
Any oil change place is as good as the next.
Personally, at 57y/o, I have never used one.
195k, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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