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found this interesting paragraph from RP's site: " we recommend changing Royal Purple approximately every 10,000 – 12,000 miles. However, we recommend to continue changing the filter every 3000 - 5000 miles to minimize the accumulation of dirt, fuel and water." I don't think I would even want to pour the oil back into the engine after replacing the filter. Ok, what I'd like to ask is that when using those full synthetic oil, most car lovers would change it around 2500~3000 miles tho most major brands claim 5k~6k miles oil change interval. Being RP racing oil users, what are your oil chaning intervals with some occasional "redline" racings and some hard boosts? I would change it ~4k-5k...... Some Zers also recommend Genium Nissan oil filter over Mobil 1 or Bosche or K&N, what is so good about the OEM tho it has that one way valve or something? TIA. Erick
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