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Hi,
7500mi., 15k mi. or 20k mi. - it's your car and your money. No one ever hurt their engine by changing the Oil early.
But, for those in the 20k mi. Club, consider this - that Change Interval assumes Ideal Driving Conditions.
Have a K&N, S&B, True Flow or other gauze type filter (Oiled or Dry)? - Shorten the interval. Live in a dusty (include Expressway driving - terribly dusty environment) or Rural area (or travel through one)? - Shorten the interval. Commute in Stop & Go traffic? - Shorten the interval. Short drives, under 10 mi.? - Shorten the interval. Weekend only driver? - Shorten the interval. Drive fewer than 20k mi. in a year? - Shorten the interval. Live in a Hot Climate? - Shorten the interval. Live in a Mountainous or Hilly region? - Shorten the interval.
No one from Exxon-Mobil, Porsche or even AAA will dispute this. How much should you shorten the Change Interval? Well, it depends on how often or severely you encounter the conditions described above - and we're back to debating...
Happy Motoring!... Jim'99
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