Originally Posted by willtill GN4 is good oil, but you should just now stay with synthetic. See if you can return the GN4... I have no idea the previous oil type history. I only have 2k on the Rotella, do you thing that would be an issue? I have 24k on my 2013
2013 F6B 1800B Don't be a thermometer, be a thermostat
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