![oil in coolant reservoir/ oil in coolant reservoir diesel engine/ oil in coolant reservoir dd15/dd13 - YouTube oil in coolant reservoir/ oil in coolant reservoir diesel engine/ oil in coolant reservoir dd15/dd13 - YouTube](https://i.ytimg.com/vi/jFFp4ExM1Gc/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLCMhHU-N9RfrcV_lnyxfxGG0ylWhA)
oil in coolant reservoir/ oil in coolant reservoir diesel engine/ oil in coolant reservoir dd15/dd13 - YouTube
![2002 7.3L powerstroke: I can never get the coolant to stay between the cold fill lines after a trip, but it never goes below this level. Any idea what gives? : r/FordDiesels 2002 7.3L powerstroke: I can never get the coolant to stay between the cold fill lines after a trip, but it never goes below this level. Any idea what gives? : r/FordDiesels](https://external-preview.redd.it/2002-7-3l-powerstroke-i-can-never-get-the-coolant-to-stay-v0-I3wEizyyPHa8GT49hpwJ-nqMbtRHjeK4BHxa5UvH-uc.jpg?auto=webp&s=7ea2c6b04c1c065b6063f3cf3db6735a0918c617)
2002 7.3L powerstroke: I can never get the coolant to stay between the cold fill lines after a trip, but it never goes below this level. Any idea what gives? : r/FordDiesels
![03 7.3 f350 i noticed a black layer in the coolant reservoir. Does this look like oil? : r/FordDiesels 03 7.3 f350 i noticed a black layer in the coolant reservoir. Does this look like oil? : r/FordDiesels](https://preview.redd.it/mkehf0y534m71.jpg?width=640&crop=smart&auto=webp&s=4fb855c20e332d6a9774104927734b51d010f5c6)
03 7.3 f350 i noticed a black layer in the coolant reservoir. Does this look like oil? : r/FordDiesels
![Amazon.com: 904-225 Engine Oil Cooler Replacement for Ford F250 F350 F450 F550 7.3L # 1C3Z6C610BA 1815904C2 F4TZ6A636A 1C3Z6A642AA 1C3Z6K649BA : Automotive Amazon.com: 904-225 Engine Oil Cooler Replacement for Ford F250 F350 F450 F550 7.3L # 1C3Z6C610BA 1815904C2 F4TZ6A636A 1C3Z6A642AA 1C3Z6K649BA : Automotive](https://m.media-amazon.com/images/I/51gvTKqL6lL.jpg)