On my 2009 Subaru Forester and 2010 Honda Odyssey (wife's) I run 1 year or 15k mile intervals. I run AMSOIL 0W20 and 0W30 engine oils with AMSOIL 15 micron filters. Note that your OEM, Napa, WIX, etc filters are only 35 micron filters.
On my 2002 Dodge Cummins turbo diesel, I run 1 year or 25k miles on AMSOIL AME 15W40 Heavy Duty Diesel and Marine engine oil. To keep the oil clean and free of soot (since it is a rather modified hot rod diesel) I utilize AMSOIL 15 micron Eao filters and an AMSOIL 2 micron bypass filtration system. I change filters half way through the interval.
The soot particles that do the most wear and tear in a diesel engine are in the 7 to 12 micron range. For reference, a human hair is about 70 to 75 microns in diameter.
The AMSOIL Bypass Filtration systems work on any engine, gas or diesel, and are rated at 2.00 microns at 98.7% efficiency. And since AMSOIL is a true Group IV PAO synthetic, it retains TBN and resists acidification much longer than a conventional Group II or mineral-oil based Group III synthetic.
Better oil, better filtration, better protection.
-Chuck
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Change your thinking, not your oil.
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