I've heard about slow oil pressure build up in cold weather; usually -20 or so; fresh 15/40 oil should be ok down to that temp.Consistant low temps and you need lighter oil. How long did the engine run before the alarm went off ? Pump is all gear driven, but cold oil may have forced the pump pressure by-pass open and held it until you shut down. This may never happen again , but it is something to watch for on cold start up.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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