The Random E46/ZHP Question Thread

How often should the k&n filter in gruppe m intake be cleaned/oiled?


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Originally Posted by san

How often should the k&n filter in gruppe m intake be cleaned/oiled?


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Dunno. I'd say 30k is a fair cleaning schedule. I think that's the factory paper filter replacement interval as well...

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Man I'm ocd then. Air Filters every 15k oil change at half of that

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Originally Posted by az3579

Dunno. I'd say 30k is a fair cleaning schedule. I think that's the factory paper filter replacement interval as well...

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Thanks BP!


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I thought those were not oil ones

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Originally Posted by johnrando

I thought those were not oil ones

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The K&N filters that GruppeM's use are oiled filters.

Question about radiator DIY -

Is there a washer where the expansion tank plate goes into the radiator? I highlighted the part in blue... When I removed the plate from the old radiator it seemed like there is no washer but there seems like there is a groove for it...

Attachment 26848

I don't recall there being one. It just sort of sits in the hole in the plastic part of the radiator.

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Originally Posted by BMWCurves

I don't recall there being one. It just sort of sits in the hole in the plastic part of the radiator.

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Thanks William! That's what I thought too but just wanted to make sure...


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I need a front caliper spring. What's a good place to buy one?