I do mine at like half intervals. I just replaced my iridiums after about 15K miles. and, you know what, the gaps were all blown out on the ones I pulled.
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2004 X5 3.0i - Sold
1998 328i Convertible (e36) -sold
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Any questions?: DICE mediabridge|gauge rings|LED Angel Eyes|front door carrier|GT1/DIS/INPA/NCS|bluetooth retrofit|SIRIUS Retrofit|fuel filter|Dorman DISA|Roof Rack Delete|Sunroof drains|AC drains|rear sway bar swap|o2 sensors|VCG|Osram Night Breakers
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