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Go Back   Chevy and GMC Duramax Diesel Forum > Chevy / GMC truck Non Powertrain Forum > 2007.5 + (GMT 900) Non Powertrain--New Body Style--
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2007.5 + (GMT 900) Non Powertrain--New Body Style-- Discussion 07.5 + Topics Not related to the Powertrain, interior, suspensions, body, wheels, tires, ect.

 
       

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Old 10-29-2009, 08:45 AM   eBay Motors   #1 (permalink)
omcvay
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How has everyone's experience been with K&N air filters? Recommendations? I also blocked the EGR and my oil still stays pretty black with early oil changes. Is this normal?
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Old 10-29-2009, 08:53 AM   eBay Motors   #2 (permalink)
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Quote:
Originally Posted by omcvay View Post
How has everyone's experience been with K&N air filters? Recommendations? I also blocked the EGR and my oil still stays pretty black with early oil changes. Is this normal?
Yes oil will always be black in a diesel but it doesn't mean its dirty. The oil pan in the Dmax engine allows almost a qt of oil to stay in the pan when drained on flat ground. I raise my front end when doing an oil change to get the most I can out.

The only way to make your oil stay clearer longer is to use a dual bypass system for oil filtration. Don't worry about your oil being black its normal. Get on a regular maint schedule based on the type of oil and filter you use and stick to it.

K&N filters pass a lot of air very well however they also are known to pass more particulate matter into your engine than even the stock filter does. I personally spend almost every wekend in the dirt and dust with the motorcycles so I still have a stock airbox on my truck.
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Old 10-29-2009, 08:56 AM   eBay Motors   #3 (permalink)
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I have been using amsoil with amsoil oil filters. Does amsoil make air filters that are better than K&N? I work in the oilfield so I spend everyday in dirt and dust as well. Thanks for the info.
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Old 10-29-2009, 09:00 AM   eBay Motors   #4 (permalink)
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I have been using amsoil with amsoil oil filters. Does amsoil make air filters that are better than K&N? I work in the oilfield so I spend everyday in dirt and dust as well. Thanks for the info.
Yes Amsoil makes filters that filter better (micron rating wise) than the K&N filter both in factory drop ins and replacement filters for intakes such as the K&N. The Amsoil filters are warrantied for 100k miles or 4 years and are dry filters no cleaning and oiling.
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Old 10-29-2009, 09:03 AM   eBay Motors   #5 (permalink)
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Thanks a ton. Checking your site now.
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Old 10-29-2009, 09:19 AM   eBay Motors   #6 (permalink)
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I recommend S&B for the air filter.

Yes, its normal for your oil to be black.
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Old 10-31-2009, 12:43 PM   eBay Motors   #7 (permalink)
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the oil is always going to be black, dont worry about it just change on recommended intervals, as for the air filter i know a lot of guys prefer the stock filter and most dont recommend the k n for a diesel.
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