Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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EOT by itself does not tell the whole story. An oil temp of 186 looks to be (to me) abnormally low. The oil is cooled by coolant, and where the EOT and ECT are measured there is no way the oil can be cooler than the coolant (unless you have a BPD oil cooler, then EOT is typically lower since it is air cooled). Thay being said, your collant should be around 190 - 192 (where the thermostat opens) or a bit higher depending on the engine load and ambient temperatures. That is the starting point for the oil temperature, It should not (really cannot) be lower than the ECT once the engine is warmed up.
Was it fully warmed up? My EOT lags behind the ECT until the truck is fully warmed up.
When you first go to start up in the morning, look at the EOT, ECT, TFT, and ambient temperaures. They should all be within a couple of degrees of each other.
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter