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Mack V8 Coolant in Oil

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I have a 1990 RW713 with a V8. I recently had some issues with it starting after setting for a month. I finally got it to start and after running for a few miles to warm it up I discovered a lot of blow by that looked like steam. I brought it home and pulled the dip stick and it was way over full and looked milky. I decided to make a few more trips to town and the more I ran it the better the oil looked and the coolant level is staying up after all that. I then took an oil sample and the results came back as antifreeze. I'm wondering if anyone has had this happen and where I should start looking? The confusing part to me is why it seemed to quit loosing coolant. Thanks for the help. 

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Yes I did. I had it pressurized for a couple hrs. 

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