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- Sep 26, 2010
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I recently went through the mountain passes in southern California with the ambient air temperatures between 110F and 115F and through part of the Mojave desert with an ambient air temperature of 111F. Truck was loaded with four adults and a bed full of luggage and gear and I saw oil temperatures between 220F and 240F for extended times (I maintained speeds of 70+ the whole way). The oil temps would recover fairly quickly on the backsides of the mountains (down to 203F within 5 miles and the transmission temperature never went above 203F).
It did make me wonder what the temps would have been had I been towing. What would be considered the temperature limit for conventional CJ-4 oil? Can it handle 240F under sustained conditions? Any consideration for the turbo? I am (and have been) running either a synthetic 5W-40 or a SynBlend 15W-40. Thanks for your thoughts!
It did make me wonder what the temps would have been had I been towing. What would be considered the temperature limit for conventional CJ-4 oil? Can it handle 240F under sustained conditions? Any consideration for the turbo? I am (and have been) running either a synthetic 5W-40 or a SynBlend 15W-40. Thanks for your thoughts!