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PLZ818

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Back in the good old days your engine was fitted with silicon/bronze valve seats which are not suitable for unleaded fuel. You will burn the valves and seats using unleaded for prolong periods without a lead additive. I think Nissan changed to steel seats in Australia around the time the 280ZX came out, but I think that was more to simplify production. Australia didnt change to unleaded until 1985.

The 98 is your best choice plus a lead additive or rebuild the head with steel seats which translates to a lot of lead additive.

BTW Premium leaded was around 97 octane. GTHO's, RT chargers and XU1's loved the stuff. Thats my Gen...

Chas

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