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25 degree Delta, after second NEW oil cooler

22K views 62 replies 12 participants last post by  JohnnyJackMac 
#1 ·
I'm really at my wits end now. I installed a new oil cooler this past weekend and took it out for a test drive today. Just doing 45-50, my ECT was 190, and EOT 205-208. When I pulled onto the highway, ECT stayed at 190.0 and EOT went up to 217.xx. I replaced the ECT and EOT sensors along with the blue spring kit. Literally a brand new replacement oil cooler Sinister diesel sent me. I had my local mechanic install the first sinister oil cooler kit a few months ago and almost instantly the temps were what they were today. Figured the first oil cooler clogged up but after my first drive I'm really not sure what it could be.

Any other sensors, boards etc I can look at swapping out?

I was using my Torque app as well as a SCT X4 to get the readings. I started off using the Torque app with my bluetooth ODBII sensor, then I switched to my SCT X4. SCT was slightly lower (about .4 of a degree) than the Torque.
 
#3 ·
Sounds like your new oil cooler is clogged as well. Maybe try a reverse flush to get that crud out of there.
 
#4 ·
I just don't see how it could have clogged so quickly. Very odd.

The first new oil cooler was giving me the exact same readings, so I reverse flushed it. Loved dumping $100 worth of coolant. After the reverse flush, no change.

Swapped out the new oil cooler, put in brand new T6 oil, new Cat-1 coolant and still getting the odd readings.
 
#5 ·
#7 ·
If it is not the Navistar or Ford oil cooler, you may see higher deltas.
 
#8 · (Edited)
Maybe you have one of the higher flow oil coolers like innovative/PPE. I just installed a PPE high flow and have a 25-28d delta. From what I researched, that's normal for the high flows since they do not have as much surface area. in my opinion if the cooler isn't clogged then a 25d delta is no big deal since the oil can run in the 400's with no damage to the molecules.

Here is a post on another forum from Innovative talking about the high flow cooler: http://www.thedieselstop.com/forums/f21/i-p-r-high-flow-oil-cooler-275349/#post2037232

if you do have a high flow cooler that would explain the 25d+ delta.
 
#9 ·
Maybe you have one of the higher flow oil coolers like innovative/PPE. I just installed a PPE high flow and have a 25-28d delta. From what I researched, that's normal for the high flows since they do not have as much surface area. in my opinion if the cooler isn't clogged then a 25d delta is no big deal since the oil can run in the 400's with no damage to the molecules.

Here is a post on another forum from Innovative talking about the high flow cooler: I.P.R. High Flow Oil Cooler - Diesel Forum - TheDieselStop.com

if you do have a high flow cooler that would explain the 25d+ delta.
I thought they took that pile of junk off the market?? 400 oil temp? I think the plastic standpipe in the oil filter housing will melt before you hit your 400°F mark...not to mention your engine will defuel LONG before that.
I wouldn't put that piece of junk in a 6.0 riding lawnmower, never mind a truck I expect to use for anything.
 
#10 ·
Whats funny is that i've called a LOT of places in the past few days and had different answers. MKM and Innovative have never heard of anything like this. Zimmy's Diesel also thought it was pretty bizarre. MKM said to run it for a few more days, possibly some air trapped in the oil system and that might be causing the high temp readings.

All the dealers I called said my coolant is probably not reading properly and not to really worry about the oil temps. :)
 
#12 ·
Another odd thing about my Ex is that the Check Engine light never comes on. it's thrown a number of codes that my scanners will find, and the light should be on but it never does come on. Very strange.

I've thought about having the dealer reflash my ECU to see if that helps anything.
At the very least I'm investigating stand alone gauges, but seems as though there really is only one place for the oil temp and that is to get a billet oil cap and hook up the gauge to that. Any other places to put an oil gauge? I really don't want to have to drill/tap the test port.

Also, anywhere to place a coolant gauge?
 
#13 ·
so it looks like the sinister is
Upgrade your stock engine oil cooler with this unit from Sinister Diesel. This cooler will allow for increased oil flow and more efficient cooling.
and the the potential cause of the higher delta's if this is true

u mess with flow and the fluid may not spend enough time in the cooler to actually cool down as much
 
#14 ·
When I ordered the oil, I thought it was a ford OEM oil cooler. MKM has been great to deal with, but had i known it was not OEM I would have looked elseware. I don't want to replace their unit again with another Sinister cooler, hoping to get my funds back and buy a stock unit somewhere else if it comes to that.
 
#16 ·
I chatted with them yesteday a few times and was told that it's their own brand of oil cooler. I feared it was Dorman product but they say it's theirs. Most likely Dorman makes it for them.

It's very cryptic on their page and Thoroughbred diesels site (I bought it through Thoroughbred). On both sites the verbage looks as though it's OEM and my invoice also talks about it being a Ford oil cooler.
 
#17 ·
well fark them that is cra.p I hate when companies sell things like that

"FORD oil cooler " they shouldn't be allowed to use the term it should say "Sinister oil cooler for Ford"

if it was a Dorman it probably would have cooled fine until the gaskets failed


I don't even know what I would do if I were you but I would request my money back
I might even ask for compensation and for them to make it clear that this is not OEM in the ad

can u tell I am pissed for you LOL

what was your oil cooler issue before the swap ?
 
#18 ·
You aren't the first to have problems with the "sinister" oil cooler. There was another guy, and I had him call them and ask them directly if it was a Dorman, and they denied that saying they make their own. I am not convinced they are telling the truth.
 
#19 ·
I emailed Eric at Innovative. He thinks I might have something blocking the oil flow and not enough oil is going through the cooler. No idea where to track something like that down.
 
#23 ·
LOL.

I'm going to drop it off at a local diesel specialist (Zimmy's Diesel) tomorrow to have them look it over. Maybe they can figure out what might be the issue. Figure its worth a try to have them look it over and their rates are very reasonable.
 
#26 ·
I just changed my oil cooler also. The one that was in when I bought the truck was definitely plugged as I was getting 40°deltas. I was running just water in the coolant side until I finished sealing the exhaust leak (a few of the joints between the manifolds and turbo weren't seated right) because I didn't want to be draining coolant every weekend until it was fixed. With just water, my deltas were 9°with new cooler. Filled her up with half distilled and half coolant lay night and I'm getting 14-16° deltas. I also did and oil change though so a little air trapped in the oil system could be to blame here
 
#31 ·
I was running just water in the coolant side until I finished sealing the exhaust leak (a few of the joints between the manifolds and turbo weren't seated right) because I didn't want to be draining coolant every weekend until it was fixed. With just water, my deltas were 9°with new cooler. Filled her up with half distilled and half coolant lay night and I'm getting 14-16° deltas. I also did and oil change though so a little air trapped in the oil system could be to blame here
i wouldn't blame trapped air

straight water(even distilled) cools better than antifreeze it's just hard on the cooling system
 
#28 ·
Not sure. It wasn't OEM and I might regret trying to save a few bucks. But I got a kit on ebay that included an egr delete coolant filter and oil cooler for $360.
 
#29 ·
I dropped of the Ex at Zimmy's Diesel on Monday to have them look it over. They drove it for a bit and had a monitor plugged in and noted the oil is running hot. They are not sure what would be causing this with 2 new oil coolers, but one thought is that the oil cooler might not be getting enough coolant flow, but they are not 100% sure what the proper coolant flow would be and now to judge if it's not getting enough. Fun never ends.
 
#33 ·
the first oil cooler install, I had my mechanic perform. He put in the sinister oil cooler, sinister EGR delete, new HPOP and IPR Valve. Pre oil cooler my temps oil temps were 225 on the highway. After the first and second oil cooler the temps are 215. So it did drop with the new coolers, just not that much. I also put in a new thermostat before hte first oil cooler swap as my coolant temps almost never moved from 178. After the new thermostat it always sits at 190.4

I'm still not 100% convinced that the ECU might not be reading the temps properly.
 
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