Diesel doesnt turn to varnish but it does absorb moisture and get algae in it which can destroy injectors, pumps etc. That's why they have water traps/drains in the fuel system.
And older diesel engines were designed to run on higher sulfer content diesel (no longer available) which requires an additive added to evey fuel tank. The sulpher in the diesel acted as a lubricant for the moving parts in the pump and injectors.
That 1993 naturally aspirated 6.2 was only 150 hp and 280 lbs of torque. Not very dependable. Very underpowered and no one is around to work on them any more (other than me) :-)
I would pass on it.
I've been running my 6.5 turbo-diesel Suburban for 27 years now.
Last edited by njsteve; 11-09-2022 at 10:12 AM.
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