Hx911 :
My 2.7 came with no trombone (optional) and originally from congested San Diego AND with the thermal reactors and probably only the 5 blade fan - PLUS dealer installed ac !!!
The prev owner I believe blew up the engine under warranty period since the case was replaced.
Far forward I still have no trombone cooler. The summer Chicago noon ambient can reach 30°-35° C (85-95°F) at times and the dash gauge (
if accurate) will read 200-210°F (93°- 99°C) stopped in traffic, but once moving along traffic signal to traffic signal cools engine down to reasonable 190’s.
I planned on adding at least a front trombone for peace of mind, but mechanic said normal touring/driving that an auxiliary cooler wouldn’t be necessary - so long as no autocross style or spirited driving was being done.
The key is to keep moving. In my summer highway travels, while driving I don’t see higher than gauge beyond 190°
if it’s accurate, street drives in summer it’s a pita to constantly monitor the gauge is why I’d say an aux oil cooler would be a relief.
Read here, some resort to cutting a hidden hole under the bumper and/or adding one of those scoops helps to get more air flow to a trombone or a 930 style cooler. More surface cooling with oil lines installed and aux cooler is designed to help…while moving, But I believe with a 930 style cooler with a Fan too, the variance in lower temps is 10-20° F difference, enough to keep things safe and worry free.
So if I were to eventually decide do this, I’d at least add some lines, an old trombone and cut some hole under the bumper, better and more $ is go with a 930 + fan route for city driving peace of mind.
https://www.pelicanparts.com/More_Info/RENE226.htm?pn=REN-E226
https://www.pelicanparts.com/techarticles/911_oil_scoop/911_oil_scoop.htm