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Message: <blockquote data-quote="sstec" data-source="post: 66078" data-attributes="member: 5862">The trick is to get the engine warmed up completely and not be in a hurry.You need to get it good and warm, then pull the drain and walk away.You are asking the upper cooling radiator to drain with no way for it to back vent. Kind of like tipping a jug upside down and expect it to just run out and not suck in any air to replace the void.The warmer the oil the better it will run back to the crankcase and drain.I try to run mine for a few hours then put the front wheels off the ground via the bucket and slide two 4X4's under the wheels pull the plug and walk away for awhile.I have a large pan for it to drain into that I use for my 7.3 diesels that hold 15+ quarts too, so I know how much has drained.You will never get it all. I think the most I have ever put back in is 13.25 quarts at a change.hope this helps.sstec</blockquote>