As a rule of thumb, any fluid that you have not changed yourself is probably due to be replaced. After break in you can stay with non detergent oil or since the engine is sludge free you can use regular oil or synthetic blend. Castrol makes oil called castrol classic which has extra zinc in it for older design engines. I will be using a modern oil with superior lubrication capabilities once my motor has been broken in. As far as the tranny goes, consult someone who has done it before because I am sure changing the fluid in these early fluid drives is a little more involved than topping up a manual gearbox. M