going to look at an 09 f350 6.4 need advice

[06SuperDutyF250]

im going with a friend to look at this 09 F350 SRW truck, has about 91,000 or so on the truck, forgot the actual number, my question is to 6.4 trucks suffer from oil cooler problems like the 6.0 bc of the gold coolant? Im going to bring a scanguage to see if i can read the oil and coolant temps, should they be within 10 degrees of each other? I know the 6.4 does suffer from egr failures, i figure if it comes out good, ill flush the system and fill with rotella elc, what are some common 6.4 failures, warning signs i should look for, i know the 6.0 alot but not as familiar with the 6.4, any input would be appreciated, thanks