ECT/EOT

If your oil is 94-97F that is odd and perhaps indicates a bad sensor. If it is 194-197F with the coolant temps you have, you are okay - on the top side of the oil cooler efficiency 15 degree delta but colder weather may allow a larger delta. If your oil is 94-97C this is 201-207F and would indicate a bad oil cooler (and another odd situation of measuring temps by two standards). How are you measuring temperatures and pressures of the engine?

Jonathan

A bad sensor will set a code but may not set the CEL. The temperature difference is an indirect measure for oil cooler efficiency. The 15 degree difference is a change from an earlier 25 degree difference previously used where catastrophic failures occured more quickly than were acted upon (under warranty). Unfortunately there is no easy direct test of the oil cooler (perhaps other than a failed EGR cooler). Excessive debris in a coolant flush is a good indicator of a clogged oil cooler. Testing the condition of the coolant is an indirect way of identifying cooling system issues too. Low protection levels provide the gateway to accumulation of debris such as scale and corrosion both from acidic reaction and erosion by cavitation.

Jonathan

There is NO WAY your oil temperature remains below 100F. Even an air-to-liquid oil cooler such as the BPD oil cooler would allow engine oil to get above 100F just from simple friction.

Jonathan

Green coolant doesn't mean it's wrong - although it is very likely wrong. If Premium Gold (yellow) is recharged with VC-8 (blue) a green colored coolant is the result. The VC-8 is the Motorcraft Recharge Package of nitrites that provides cavitation and corrosion inhibitors to the Premium Gold (G-05). Most likely though someone replaced with "universal" automotive coolant. Use of Accustrip or Fleetguard test strips will confirm whether there are sufficient nitrites in the coolant to provide adequate cooling system protection.

Jonathan

Tousley Ford Parts Depot

Here ya go.

Jonathan