New to MBZ Diesels - Some simple questions

[HuskerBenz]

I recently purchased an '83 300SD w/ 212,000 mi. The car has the common problems - tach, blower motor, cruise, minor oil leak, but runs and drives better than I imagined a 25 y/o car would.

It didn't come with an owner's manual, so I am wondering what the proper fill levels are on the oil and tranny dipsticks. OK, I know the hi and low marks are obvious when you look at the dipsticks, but I'm erring on the side of caution here:

Oil - two sets of notches on the edge of the dipstick. Am I right in assuming the upper notch is high and the lower notch is low?

Tranny - Z-bend in the dipstick. Top of the "Z" is high and bottom is low, right?

Another question.....whats the best repair manual out there? I've been seeing some on ebay for like $4-5. Any good, or best to avoid?

Thanks for you help,
Christian