Hi, I have a Gyrodec mk1 but I have applied all the upgrades so even the pin (inverted) is the last version.
For cleaning I lift the plate and then all the brass sleeve and clean very well with a clean rag all the oil, being very careful not to lose the bearing ball.
Mobil oil is the one suggested by the manufacturer in the absence of the original; it has to be completely synthetic and the exact density value I do not remember now.
In 30 years that I own the record player I used both the original and Mobil and there are no differences.
I change it every 5 years or so, but I check once a year that there is always a few drops in the container.
You could replace it once in 10 years or more, but being easy to maintain does not take much time to check.
Not being a car engine with high revolutions of rotation but only a turntable that rotates at low rpm would not serve to change it practically ever but for scruple a little check every now and then is fine.
For cleaning I lift the plate and then all the brass sleeve and clean very well with a clean rag all the oil, being very careful not to lose the bearing ball.
Mobil oil is the one suggested by the manufacturer in the absence of the original; it has to be completely synthetic and the exact density value I do not remember now.
In 30 years that I own the record player I used both the original and Mobil and there are no differences.
I change it every 5 years or so, but I check once a year that there is always a few drops in the container.
You could replace it once in 10 years or more, but being easy to maintain does not take much time to check.
Not being a car engine with high revolutions of rotation but only a turntable that rotates at low rpm would not serve to change it practically ever but for scruple a little check every now and then is fine.