6point0damn2004
New member
I have a 2008 6.4, was curious what the temperature threshold between coolant temp and oil temp should be. If coolant temp is a steady 194-195 where should oil temp be
coolant temp/oil temp
- Thread starter 6point0damn2004
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Cory S
New member
my truck is running at most a 4* variance between oil & coolant but normal driving they are only 1* off
6point0damn2004
New member
Hmmm, i have an Aeroforce interceptor to read temps. Coolant temp like i said is 195 and oil temp is always 220-225. Bad oil cooler?
Cory S
New member
i have the same problem @ 146k and it was the thermostats. they were both hyper extended
- Your truck isnt going in to reduced power?
- Your truck isnt going in to reduced power?
Strokin69
New member
Mines running 199ect 215eot and I found out my oil cooler is bad they supposed to more more then 5* what I was told by local ford diesel specialist
Strokin69
New member
No more then 5*
6point0damn2004
New member
Will it go into reduced power if tuned? I dont drive hard though, its at 102k so ill prolly have to do thermostats then. Gotta throw on a full egr delete with elbow here soon. Sittin waiting for me to install.
It hits 224* and doesnt budge, which is my only hesitation to it being a bad oil cooler, id think itd be not a constant temp if it was bad. But then again im no expert
It hits 224* and doesnt budge, which is my only hesitation to it being a bad oil cooler, id think itd be not a constant temp if it was bad. But then again im no expert
Cory S
New member
my wasnt tuned at the time. but i was seeing the same temps you are. i would do the thermostats when you do the egr. it sucked putting the egrs back on.
6point0damn2004
New member
Yea thqts what ive read. Ill have to order those then. Appreciate the responses. Thanks
Strokin69
New member
my thermostats was shot i had rudys replace them and do their egr delete and after pulling at tractor a short distance my mini maxx when into defuel mode bc i got my set at 225 recommended by h&s bc ive heard from diesel specialist they do alot work on 6.4 220* maxx out on eot so if ur eot is that high i would put money on a bad oil cooler and if it is a bad cooler might as well bulletproof it bc the cab has to come off.
Strokin69
New member
they told me normal driving ect 194-200 eot 199-205 they should not be nomore then 10* off
CaseyJ
New member
Who makes a bulletproof oil cooler for the 6.4? I can't find anything besides stock, and BPD only seems to make them for the 6.0 as well as the relocation kit.
forcefed6.4ford
New member
Just so you guys are aware. rpm has a lot to do with your eot/ect. I have 4:30 gears and my temps are always 7-10deg apart at 2300rmp/70mph. Loaded doesnt change much but just a little hotter.
As far as what is normal operating temps for the eot/ect... They vary but I run 199ect vs 206eot (+90f ambient) all the time. Ford considers 220eot to be acceptable. Hell the fan doesn't kick in until 215eot.
As far as what is normal operating temps for the eot/ect... They vary but I run 199ect vs 206eot (+90f ambient) all the time. Ford considers 220eot to be acceptable. Hell the fan doesn't kick in until 215eot.
6point0damn2004
New member
Im gonna change the thermostats as its cheaper than taking the cab off. See if that fixes it and go from there. I dont have any oil in my coolant
forcefed6.4ford
New member
The oil cooler is not a cab off repair either. It's in the front of the valley. The high pressure fuel pump is in the rear. If the hpfp can be replaced cab on (with a few swear words thrown in) the oil cooler should be no problem.
6point0damn2004
New member
Oh ok. Not bad then i took the cab off my 04 myself and ive heard these are easier to lift it off of so if worse comes to worse i can fall back on that. But i was thinking by seeing where the cooler is i could do itwith the cab on
tbsimmons
New member
Mine is the same way. RPM for an extended period plays a huge roll, more so than load from what I have seen. Mine has been in the 230's pulling a steep hill with 18000# behind me, but cooled right back off after. My split can be as high as 15 or as low as 5. I dont really worry about as long as the coolant and oil temps go up and down together.
6point0damn2004
New member
Well when the truck is warming up it can be as far apart as 50* but it constantly rises together , which is one thing that makes me think the thermostats are in need. And like i said it hits 224-225 and stays there, no higher, does drop down sometimes to like 218 or so when coasting down a hill or whatnot. ECT stays right at 194-195
