You can see read my experiences on the Amsoil HDD 5w30 series 3000 oil in the diesel oil analysis. It is under 46k on oil change. Go back a few pages and you will find it By the way, I just sent in an oil test but no report yet. The engine has 178k on it. It burned 2 qts. in 13,500 miles since last oil change. Many think I am foolish for going by oil analysis but so far it's proof the oil is still good or the motor would be junk a long time ago. I will post the results when I get the email back. Should be good though, only has 13.5 k on it. The oil has the ability to last 50k. I change it though as soon as any result goes past normal, even if it's not critical. Later, ihookem. P.S. 7/30/11 was the last post of " Amsoil with 46k on it."
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