The 460 chassis Gs had low compression pistons to allow the use of poor quality fuels all around the world. My '90 300GE had a knob underhood to retard timing in the event low quality fuel was all that was availible. The 280s unless fitted with high compression pistons should run on anything this side of Jack Daniels. Brent

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1995 G320
1984 280GE
1971 Unimog 416