I need to ask those here what I might be missing - I tow the rig shown and on passes my oil temp recently hit 230F from a steady 195-200F on the freeway. The fan comes on but the 'feel' is too hot to ignore for long.
My 07 RB50, 6.0 PSD with a 97 Ski Nautique (looks close to Jwinterstellars rig). Usually I only tow locally to launch and retrieve the boat at the beginning and end of the seasons so I hadn't noticed this until last weekend. We went over to eastern WA in mild weather (60-70F). On our route we hit 3 passes, not high, with not hot ambient temps. Two of the passes allow me to keep the rig in OD most of the way, one does not - so I switch off OD and slow to 50 or so. Once in OD the oil temp ramps right up to 230, fan kicks in. On the other passes the temps stabilize at 210-215 but will creep up to the fan on setting of 230 by the top of the pass. I cant imagine running that hot for long, nor can I imagine trying to pull this setup over a larger pass in hot weather as found in the southland.
The coolant temps run 6F lower than the oil, and on the downhill side temps drop right off to the normal ranges telling me the oil cooler isn't plugged and the cooling system can drop heat when the loads are reduced.
I am monitoring the temps with a scan gauge II. The van has stock bumpers, a billet grille, the newer OEM oil cooler, Bullet Proof Diesel EGR cooler, a coolant filter, mild towing power tune, 4" exhaust from the body floor level back. I have not changed or moved any other system coolers. If any other info is needed let me know.
It looks to me like similar and bigger loads are being pulled, in hotter climates --- so what mods have been done, or how hot do you all get? Thanks in advance, Matt.[photo][/photo]