just bought a 2004 Volvo S60-R 6 speed. i bought it from my work, the vehicle was a trade in. we changed the oil 4 months ago with a Napa filter and Mobil 1 5w30. the car has sat on the lot since then. ive driven it somewhat hard since i bought it yesterday. i was thinking of changing out the oil and filter. the filter is a cartridge type. we have a volvo dealer next door and i get the jobber rate for pricing. should i stick with OEM for the filters? i was planning on using German Castrol for the oil and change at 5k miles. Volvo recommends 7500 miles.