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July 14/15

18,000 Miles (30,000 Kms) - Oil change interval

'04 GMC Sierra 3500 6.6 L Duramax Diesel

Yes, you read that correctly.  

In June of 2014, I had run 14,780 miles (23,800 kms) over the course of 12 months and had the oil tested by a local Caterpiller Tractor dealer at their oil analysis lab.  The results were great.

In July 2015, I had extened the interval yet again (as per my headline above) and had the oil tested at the same facility.  Again the oil is fine.

For my truck application, I use the Amsoil 15W40 Diesel & Marine as recommended by Amsoil.

http://ideal-performance.wboil.com/storefront/ame.html

I also used the Amsoil EA Oil filter which is rated to 25,000 miles

http://ideal-performance.wboil.com/storefront/eao.html

If you are not sure about what Amsoil products to use in your application, follow this link.

http://www.amsoil.com/mygarage/vehiclelookuppage.aspx?zo=1803353&page=%2fproducts%2fapplication_guide.aspx

Test results on the oil analysis are below.

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