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Message: [QUOTE="COF350, post: 1485187, member: 18014"] My 15 with GH SOTF tunes will hit 240 pretty quick pulling camper on tow tune. That's without really working it, thing is it never really climbs over 242-245 when really working it up in the CO mountains. I don't worry too much about it, I run fully synthetic 5w40 Delo and most synthetics are good to 300+degrees far as I know. I agree with previous poster that oil coolers on these are not nearly large enough for people who actually work them towing...I may start looking for an upgrade. I have a cummins 15 L and a Cat 15 L in two different big rigs and it's a different world, we never see over 220 ish on oil temp pulling 90k lbs...but those motors are made for a high load for long periods of time. Sent from my iPhone using Tapatalk [/QUOTE]

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