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Message: <blockquote data-quote="Thomastech" data-source="post: 20155" data-attributes="member: 2058"><p>When we talked on the phone the other day, I was specifying the API rating on the oil for you so that you would know how to distinguish between the different types of oil. When you have a diesel engine, you need to be sure to use an oil with a API rating of "C" example CG and when you have a spark ignition engine you need to use an oil with an API rating of "S" example SH. All the oil we use in our hydraulics is the same as we use in the engine with the difference being in the fact that we pre filter the oil to a cleanliness level of ISO 17/12 to prevent damage to the tight tolerances in the hydraulic components. All oil which is added during daily checks, and services should also be prefiltered to reduce the risk of component failure due to contaminants. The -4 oil is for the newer tier engines which are designed to meet certain standards set by the EPA for emission levels. Here is a link to read up more on API classifications, http://www.finalube.com/reference_material/API_Engine_Oil_Classifications.htm</p></blockquote><p></p>