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I actually might be in the best possible position to say that my 1997 Porsche Boxster always had Mobil 1 0-40 every 2,500km (overkill I know, waste possibly) and new oil filter every 5,000k. New pink coolant and distilled water every 4~5 years. ATF change twice (50k).
20 years old car and literally nothing leaks on the thing (original coolant cap, go figure). RMS is fine, no rad damages or hose leaks, original water pump, no oil dripping. Just nowhere, zero.
Approaching 100,000 km, kept indoor 90% of the time.
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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