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Discussion Starter · #1 ·
Hi, this is my first post on this forum, and I look forward to being a new member.
I bought a 05 6.0 about two months ago. They guy I bought it from studded it, did an egr delete, put 155cc injectors in, upgraded the FICM, along with new cold air intake, and straight pipes. He gave me a thermostat when I purchased the truck as well as told me he’d do a new or external oil cooler if he were to keep the truck because that was one of the last things on his list to completely bullet proof the vehicle.
I bought the truck in FL and drive around for about 1 month with no issues. I then began driving up to NY with it. Within about 5 hrs I started having overheating issues. My oil temp got up to 245 and then I started experiencing loss of coolant. Stopped at a shop in SC where I reluctantly let them put blue devil in the coolant to try and patch the small leak in the radiator. 30 miles later the radiator blew, I then had the radiator replaced in which I’m almost positive they didn’t flush the system. Another couple hundred miles later my oil temp climbed to 275 before I finally pulled over and had the car shipped from NC to NY.
I just got the truck and changed the oil, I ran a head gasket test and my heads aren’t blown or leaking. There is no exhaust gases coming into the coolant nor is there coolant coming out the exhaust or into the oil. Around town the truck runs great and my coolant and oil temps stay within a normal range.
What do y’all think I should do? My plan is to flush the coolant system and replace the thermostat. We’re also thinking about replacing the oil cooler, however that is going to be a full weekend project that I’m not looking forward to. Is there a way to flush the oil cooler with the EGR deleted? This truck is going to be my work horse and I need it to be reliable.
 

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If the head gasket test you are referring to is a chemical (color based) test, then that test really doesn't mean much.

Your best bet is installing a pressure gauge on the coolant system.

The most common reason for radiators blowing the crimped seal is due to over-pressure (IMO anyway).

If you want an oil cooler backflush, there are hundreds of threads on it. Fixur6 makes an expensive product that works for doing a backflush. You can rig up your own. That said, sometimes even the best backflush does not remove the material that is clogging the oil cooler.
 

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Discussion Starter · #3 ·
If the head gasket test you are referring to is a chemical (color based) test, then that test really doesn't mean much.

Your best bet is installing a pressure gauge on the coolant system.

The most common reason for radiators blowing the crimped seal is due to over-pressure (IMO anyway).

If you want an oil cooler backflush, there are hundreds of threads on it. Fixur6 makes an expensive product that works for doing a backflush. You can rig up your own. That said, sometimes even the best backflush does not remove the material that is clogging the oil cooler.
Thanks for the response. I just drove the truck 15 miles yesterday and there was a huge difference between my oil temp and coolant temp. My coolant didn’t go over 161 degrees and my oil was up to 201 by the time I parked. Is this a pretty good sign my oil cooler is clogged or bad?
 

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Not necessarily, but it is a warning sign for sure. You really need to get the coolant temperature up to the full intended operating temperature (thermostat setting of around 192) for it to be a 100% valid test.

That said, my oil temperature ALWAYS lags the coolant temperature until about 2-3 minutes after the coolant temperature levels out at 192 (ish).
 

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Hi, this is my first post on this forum, and I look forward to being a new member.
I bought a 05 6.0 about two months ago. They guy I bought it from studded it, did an egr delete, put 155cc injectors in, upgraded the FICM, along with new cold air intake, and straight pipes. He gave me a thermostat when I purchased the truck as well as told me he’d do a new or external oil cooler if he were to keep the truck because that was one of the last things on his list to completely bullet proof the vehicle.
I bought the truck in FL and drive around for about 1 month with no issues. I then began driving up to NY with it. Within about 5 hrs I started having overheating issues. My oil temp got up to 245 and then I started experiencing loss of coolant. Stopped at a shop in SC where I reluctantly let them put blue devil in the coolant to try and patch the small leak in the radiator. 30 miles later the radiator blew, I then had the radiator replaced in which I’m almost positive they didn’t flush the system. Another couple hundred miles later my oil temp climbed to 275 before I finally pulled over and had the car shipped from NC to NY.
I just got the truck and changed the oil, I ran a head gasket test and my heads aren’t blown or leaking. There is no exhaust gases coming into the coolant nor is there coolant coming out the exhaust or into the oil. Around town the truck runs great and my coolant and oil temps stay within a normal range.
What do y’all think I should do? My plan is to flush the coolant system and replace the thermostat. We’re also thinking about replacing the oil cooler, however that is going to be a full weekend project that I’m not looking forward to. Is there a way to flush the oil cooler with the EGR deleted? This truck is going to be my work horse and I need it to be reliable.
May
 

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May be able to back flush the oil cooler. Has worked for a few.
We had a similar issue, didn't realize it. The oil coolers on these things seem to be a weak point, so may need it changed.
Also may want to test your oil and filter. We used a place by mail. The test indicated that the engine suffered severe bearing damage with high silicate and ferrous metal counts, so we changed engines. Be sure to send a piece of the filter as well.
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