Just for your interest , I'm sharing some advice given to me by the penrite technical team, to some questions I asked about lube oils.
cheers simmo
Hi Guys at penrite, I'm a long term customer of your fine oils, In my 1995 Land Rover defender 300 TDI, with R380 transmission and LT-230 transfer case, I'm using Progear 70-75 full synthetic in my gearbox , and trans gear semi synthetic in my transfer case (75-90) and diffs,and semi synthetic 15-50 in my diesel engine. I'm interested in the viscosity/ temperature curves for the gearbox oils. my transfer case is running between 60 -70 degrees and my gearbox is running at 75 degrees, engine sump is 75 degrees, diffs 45-55 degrees. ( ambient was about 25 degrees), temperatures at cruising speed on the motorway, I'm considering gearbox and transfer case coolers, because I expect the temperatures will raise up in summer when the ambient is higher. I'm trying to find what is about the optimum temperature to run the gearboxes, so the oil still has acceptable viscosity.
I appreciate your advice. thanks for your support. brgds simmo.
response from Penrite technical team.
When the temperature of the oil reaches 100C then any moisture should be driven off very easily- not a bad thing. This is perhaps a good target temperature.
You will not need cooling by the looks of things ?our oils will easily cope as this is what they?re designed for.
In an oil?s rating --eg SAE 75W-90-- that second figure is derived from a check of the oil?s viscosity at 100C.
If oil is frequently up to 130C you can start to run into trouble, but this is only likely in the engine.
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