Yea, that's not a bad temp at all.I saw 239 coming up Fancy Gap on a cold day!
From the info i've gathered over the years, it's beneficial for oil temps to be at least 220-230* regularly to burn off moisture and excess contaminates. And the 240-280* range is acceptable and the modern synthetic oils are capable of handling this.
What was considered high in Gen2s and I wonder what people are seeing with Gen3 towing 8-9K# in stock form..
Either way, that 40w oil should be just fine on viscosity reading at those higher temps.
Are there legitimate service manuals produced/available by FCA for these engine which show bearing clearances etc?