Oem system is garbage, lines and fittings always leak and the 2 special metal/rubber crush washers for the housing bolts arent being made anymore and impossible to find. External setup would work much better service easier and cool better
OEM system isnt perfect
Lines and fittings always leak? quality lines and proper installation tend to solve your issue there.
The crimp barrels on the lines tend to leak, those can be replaced by using oetiker clamps on the hose passed the ferrule in the metal hard line. if it leaks you have a bad hose section which is replaceable by bulk section cut right. then The housing crush washers which have a grommet , i know what you speak of., Ive seen someone find the number. So skill issue. i think they had a roadmaster so im sure the tbi in the roadmaster didnt have a different cooler, but i could be wrong.
You could, if you wanted OEM But not this year OEM, use the pre Gmt400 oil cooler sandwich adapter which fits above the filter and just plumbs out 2 lines. It would be better than THAT.
But as stated when you can have oil temp at the right place its going to be better for everyone.
Vote 0/10 skill issue, lacks effort