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Old 10-04-2009, 06:19 PM
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high pressure oil

hi i have a quick question if somebody can help me. i have a 99 7.3 f350 and ive had a guy tell me when i change the oil i have to change the three quarts on the high pressure side also. is that true and if so how do i change it thanks Daniel
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Old 10-04-2009, 06:26 PM
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This is not true. The oil in the high pressure system is the same oil as the oil in the pan. It's constantly getting exchanged, the low pressure oil pump simply pumps oil from the pan to the high pressure oil reservoir, then to the HPOP, and eventually through the injectors and back to the pan.

When you've done a fresh oil change, it only takes a matter of seconds for the new oil to get pumped from the pan to the top side of the engine to the HPO system. Save yourself the time and energy, it's a totally waste.
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Old 10-04-2009, 06:32 PM
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thank you sir thats all i needed to know, i thought that but new to the diesel world and thought id ask around and make sure
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Old 10-05-2009, 01:08 PM
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Yep just idiots not understanding the system.
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