I did a search and found a bunch of different answers to the type and grade of oil to use in the gearbox.
1st, is there a pictorial of the area's that require the oil to be filled? I understand there is more than one location.
2nd, is it fair to say that the oil should be synthetic as the online manual says? Doesn't say grade/viscosity etc.
*. Where are the actual locations of the fill plugs & can they take the same oil?
*. I read in some of the comments the oil levels should be this or that, and using a wire as a dipstick works, but can you actually see the oil level and reference it to the height level from looking inside?
Pic's would be great if available!!
Sorry for all the questions, I have been running this 520 for 4 seasons or more and I keep a small board underneath the gearbox area to keep from dripping on the cement floor, which the board has been getting stained. I assume the oil levels are low and I would like to address this soon.
I can't say for sure that the gearbox assembly is from the early 60's, but the 520 is, it has the round porthole front door.
Thanks for any reply's