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Thanks. The only issue is that there is no work history of an oil change/additions on these machines and that is quite a bit of oil to add even over an extended period to get the viscosity to where we see it. Since we changed the oil to the proper grade I guess I will chalk this up to one of those strange mysteries that happen in power plants that are never explained. I guess I won't spend any more time investigating.
RM
We have a similar issue with a PG320. The problem happens in most of the gearboxes we use it. We keep getting sample reports with VG reduction down to about 260-280. We had a go at adding 460 to bring it back up but only with guessing the amount. These machines have been running for 10 years. Due to group procurement agreements we have to use oil from a certain company. With the two previous companies we used there was no such issue with VG changes. Any thoughts on what could cause these VG issues?
RM

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