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80 720 oil type


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Dont use synthetic.  It has a tendency to leak more.  But change ur oil every 5k.

 

30w....if you live where it doesnt get cold.

10-30 otherwise, 5-30 if you have to

20-50 when it is warm.

I also use diesel oil in the summer

 

The new oil doesnt have zinc, like it should.

 

You can buy a zinc additive (bad for cats).

 

Racing oil will have it.

 

AND, you just openned a can of worms

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Oil should be selected based on the lowest expected temperature till the next change. From 0F and up 10w30 is fine. If never below 20F any 20w oil will do. Never run a 5w or 10w oil above 60F. I run only in the summer with temperatures above 60F so 15w40 works well for me.

 

New oil has reduced their ZDDP levels to about half what they used to be when our Datsuns were new.

Diesel oils are the cheapest easiest way to maintain the correct ZDDP levels and is universally available. There are others but I use Shell Rotella T4.

Synthetic is too expensive for protection you will NEVER need. In my experience it leaks out of old engine seals. If the synthetic lasts 12K between changes you will probably have added 4 quarts in that time to keep topped up, so what have you really saved? 

 

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