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duramaxdiesel 09-29-2006, 11:08 PM There are so many types of motor oils out there with CI-4 and CH-4 ratings. What's the difference between them other than the price? I change my oil every month regardless and can buy Carquest oil for about $1.59 a liter instead of the Rotella that I'm using now. Thanks, Nick txguppy 09-30-2006, 04:05 PM Basically the ratings are for different year model vehicles as emission standards get more strict. The latest oil rating CI-4 is for the latest 2007 year model ULS diesels. This newer oil has better additives to run cleaner and lube these engines better. I know there's probably a more scientific explanation, but this is what I understand from web browsing. So, just use at least the API rating what your book calls for. There's no need to go higher. The ratings go up alphabetically CG-4, CH-4, CI-4, CI-4+...... C.A.P 09-30-2006, 04:06 PM at once a month its prolly not a huge factor as long as its a good 15 40 . you change it before it has a chance to break down ! duramaxdiesel 09-30-2006, 08:07 PM So I should just buy the least expensive oil I can find as long as it has the rating I need. I do about 6000Km a month and sometimes I like to lug her when I get a tailgater. The oil is black as coal after the first smoke session. | ||