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My opinion is that the mfg probably knows best, at least about making a car last until the warrentee period.
I personally change my oil at 5-6k in my dd 06 wrx. It seems like a good compromise between sudgested and wastfull. I can do it in 15 min. I use shell rottella synthetic in all my cars except the 930. Mostly because it is well revied and is cheap at the neighborhood walmart.
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84 930
18 Cayman GTS
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