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Message: [QUOTE="CATDiezel, post: 1355813, member: 4387"] I'm only posting this so others aren't grossly misled. Your comparing Apples to cheese crackers wanting to use cooler oil temps and higher oil pressure on a MTU gen set compared to a 6.7l automotive engine. Oil temps are designed to run in areas that give the best lubrication rate for weight of oil. An MTU is a giant POS that gets overhauled at half the interval of a quality branded and built engine. Oil temps on a 6.7l are optimum at 200* or better. The viscosity and friction are much lower at higher temperatures. Pressure is designed to keep the molecules from cavitation at lower pressure. (Think how distorted the water is from a garden hose at high psi vs low psi) If you want a higher viscosity engine oil without altering the cooling system then put 75w90 in the crank case!!! Lol.... your essentially doing that by cooling the oil by 40*F Do some research on the subject of oil before going crazy with changes. Otherwise run a 15w40 for high hp engines with 210*F oil. The viscosity is perfect regarding what engineers have deaigned. A MTU needs high oil pressure because of substandard tolerances and extreme bearing wear from a poorly designed engine. It's literally a throw a way engine. If I ever see a oil field application with an MTU I quietly laugh and get the duck tape out. Because that's all they are willing to pay for any repairs! Now with that said. The larger concern is keeping the oil and coolant differential temperature close to each other.... food for thought. [/QUOTE]

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