Nothing says BITOG quite like a good 'ole thick versus thin debate.
Here is a question that I run across on the Mobil Industrial forum recently and the official Mobil response.
Question posted:
As we know, optimal viscosity helps to form a lubricating film, keep machine components cool, seal the system and control oil consumption. Therefore, what will happen and possible condition to machine if we change ISO 150 to 220 of gear oil. Are there any significant effects on machine? But, EB only describe to use ISO 150.
Here is the response:
Hello,
In general, the use of higher viscosity oil will tend to run hotter due to more internal friction within the oil. As a rule of thumb, when operating above 60 deg. C, every 10 deg. C increase in temperature, the oxidation rate will double, thus will reduce the life time of the oil becomes half. The oil becomes more prone to oxidation. This also applies to gear box elastomers.
When there is no changing in gearbox design (speed/load), the gear box should remain running with ISO VG 150 oil.
Hope this helps
Best Regards,
Teguh Mawardhana
SAP Technology Support Engineer
Here is a question that I run across on the Mobil Industrial forum recently and the official Mobil response.
Question posted:
As we know, optimal viscosity helps to form a lubricating film, keep machine components cool, seal the system and control oil consumption. Therefore, what will happen and possible condition to machine if we change ISO 150 to 220 of gear oil. Are there any significant effects on machine? But, EB only describe to use ISO 150.
Here is the response:
Hello,
In general, the use of higher viscosity oil will tend to run hotter due to more internal friction within the oil. As a rule of thumb, when operating above 60 deg. C, every 10 deg. C increase in temperature, the oxidation rate will double, thus will reduce the life time of the oil becomes half. The oil becomes more prone to oxidation. This also applies to gear box elastomers.
When there is no changing in gearbox design (speed/load), the gear box should remain running with ISO VG 150 oil.
Hope this helps
Best Regards,
Teguh Mawardhana
SAP Technology Support Engineer