I'm going to go with the BMW service intervals. I change oil in my '96 Porsche every 15,000 miles. I'm at 277,000 miles with no major engine work! Most of my miles however are on the highway.
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Rich
'96 911 C4 Cab (276,000 1 owner smiles)
'11 X3 35i Black Sapphire/Beige,SAP, CP, CWP, DHP, PREM, TECH, Sat radio, Hi Fi, BMW apps, smartphone, 19" w/mixed performance tires.
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