I purchased a 2006 e350 with 145,000 miles. A mechanic pre-purchase inspection said healthy engine. Invoice shows work done in 2013 to the tune of $5000US but did not list the items replaced. Heads studs where replaced (visible), and apparently a new oil cooler, EGR delete, dummy plugs, and fuel tubes? It was done by a H&H Diesel Performance whose phone seems to be out of service, so no way to talk to mechanic.

I just drove Flagstaaf to Dallas and the engine sounded and ran great. I was able to drive long stretches to test oil cooling at speed over a half hour test period for each speed and recorded the following:

Mph EOT ECT
75 201 191
70 197 188
65 195 188
60 195 186
60 208 198 On a 1/2 hour uphill grade

FICM 48.5-49

From what I have researched, this looks within specs, but just talked to a certified bulletproof diesel shop (through bulletproofdiesel.com) and they say EOT-ECT should be within 7-8 degrees of each other. Also said if fan clutch is running all the time that is a problem, but did not notice if fan clutch was running a lot.

Any comments here on if I should put in a new oil cooler? Seems good to me as is.

 

 

I stole that from another member. How are you getting you data?

was the truck up to operating temp?

Just noticed the half hour test speed
In the how to it says 15* delta

 

Your ECT/EOT delta isn’t terrible but you might need an oil cooler flush to get the deltas a little tighter.

 

using scangauge. Yes, truck was at operating temps for all readings. Ran van at those speeds for at leadt half hour before readings. Readings wete stable.

 

Thanks for that pic @6point0 , I snagged it for future reference

Hello, @Belize , missed that it is a van -- your low coolant temps are gonna make the deltas seem off
are you running the heater a lot in these tests? The heater can pull the temps down
otherwise the t-stat sets the base temperature for the engine -- may need replacing
the engine coolant should be around 192F