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I had '11 Benz and '04 GT3 that I put approx. 4K miles a yr on using Mobil1 0W/40. I contacted Mobil regarding oil changes and they recommended doing it annually. Their reason was due to the natural degradation that occurs in engine oil once exposed to moisture and other contaminants.
I do my own changes so the cost is minimal (5qt jugs for $35 at WallyMao plus an oil filter).
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Sergio
The GT Lid Whisperer
PCA 42yrs - National DE Instructor / Ex-RGruppe #197
'19 718 Cayman S (9th Porsche/1st with PDK)
'14 Subaru Forester XT (Porsche support vehicle)
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