The 2.6 engine has hardened steel exhaust valve seats, and as such does not require lead in fuel to lubricate the valve seats.
It is also low compression (7:1), and hence can run on any petrol sold today in Australia.
So the answer is, no additives are required.
For completeness, the four cylinder engine has the exhaust valves seated in the cast iron of the head. This means that the engine is possibly susceptible to valve seat recession without lead or a substitute in the fuel, although experience shows that this is not a problem unless the engine is used with sustained high speed and power operation. And even then, regular tappet checks will show if it is happening, and steel inserts can be added to the head when it is overhauled.
The 7:1 four will be happy on any fuel sold here today, but the 8:1 may prefer 95, and if the compression has been raised above that expect to need 95 or higher.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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