JAJ
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- Apr 9, 2016
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- 2016 GT350 Track Pack
The driver side crankcase vent is open to the atmosphere via the intake duct. Would need to be plugged.
If it's a big concern to leave it in until your next oil change, and you have access to a vacuum pump, you have another option. Pull the engine oil dipstick and hook a vacuum hose up to the hole, sealed around the opening. Once you pull a vacuum it will suspend the oil in the sump well enough for you to remove the UPR plug and swap in the OEM plug without losing any oil or making a mess.
Please note that I have not seen this done on a Coyote/Voodoo/Predator with their larger diameter drain holes. Only seen it done on a conventional metal oil pan with a ~1/2" diameter drain hole. I suppose it's possible that the vacuum pulled through the dipstick hole might not be strong enough to suspend the oil with the larger drain hole. Not sure.
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