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Message: <blockquote data-quote="2005DMAX" data-source="post: 31981" data-attributes="member: 3437"><p>10-30 oil is too light for diesel engines. I would stick with the 15-40. I have always used Shell Rotella 15-40 for years. I recently made the switch over to Mobile Delvac 1300 15-40 as I feel it is a better oil. I have a 753 and would assume the levels to be about the same. A manual can be downloaded here: http://www.mediafire.com/?sharekey=31fe914bdce0f59019747bd91027d4ddf46528a8107c8e29 I belive the hydraulic/hydrostatic system takes 14 quarts, the chain case takes 8 gallons. Engine oil on my 753 was 7.5 quarts. The cooling system says to use propylene glycol, but I flushed mine and put in ethylene glycol (automotive antifreeze). Ethylene glycol has better heat transfer properties than propylene glycol. Just remember, the two do not mix well, so make sure whatever you add, it is the correct product.</p></blockquote><p></p>