Just picked up a 73 240Z less than two weeks ago and looking to replace all the fluids. The car has the L28 engine upgrade, in excellent condition, but has not been driven much in the last five years. I plan on getting the car inspected by a Z specialist this week but will change the fluids myself. Any info on brand, viscosity, etc..would be appreciate it

Download the factory service manual. It has the specs. 

The FSM is available in the Downloads section of this board. I have a link in my signature.

A couple of tips.

1. Before draining the transmission or the diff remove the filler plug first. Sometimes the filler plug is very hard to near impossible to remove. Once you drain the oil, the car is inmobile and all your options are gone with it.

2. Transmission: Try oil from AC Delco or GM. Yes, it does wonders on these old trannies. The part numbers are AC DELCO USA part number is: 88900399. GM USA part number is: 12377916. I can not order the GM or AC delco oil here in Europe. I'm using Redline MT 75W-90 and find it very good.

Grease the rear driveshafts' u-joints.  The propeller shaft u-joints might have Zerk holes also.  You might need to get a Zerk fitting since Nissan plugged the holes with screws from the factory.  The ball joints need grease also.

There are two ways you can change the fluid in the brake system.

1. Using the master cylinder / foot peddle method

2. Using a vacuum unit to refresh the fluid.

 

I prefer the vacuum system because it doesn't require the master cylinder. The method using the master cylinder can damage the master cylinder rubber seals. The master cylinder normally only uses half its stroke and when you bleed the brakes using the master cylinder method you use the full stroke. Old fluid can corrode the cylinder section that is not wiped regulary by the seal. That corrosion can sometimes damage the seal when the seal goes full stroke.

Mark Lyons' website is a great source for general Z knowledge and he also sell a few parts as well.    

https://zcarguide.com/

Edited October 18, 20222 yr by DatsunZGuy

I always use a soappump to empty those little reservoirs, you clean it up into the old soap bottle and when you cleaned out the reservoir with a clean rag (dispose the rag after that!)  you then fill them with clean brakefluid. (now you don't have to pump all that stuf through your cylinder.. and your reservoir is also clean.)  And when your ready emptying you screw that pump back in the bottle (ex soap bottle) and you don't get any brakefluid on your car or shop.. (what will damage your paint! )   Brake fluid.. you don't want that on your car or towels!

Edited October 19, 20222 yr by dutchzcarguy