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Originally Posted by Markusss
With the price of gas going sky high, I was wondering if my 2000 GTP could take a lower grade of gas. What would happen if I put regular or midgrade gas?
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Its possible depending on the circumstances. Even GM says that you can go as low as 87 octane in the SC Series II 3800 but in emergency situations only.
If detonation is sensed due to the lower grade fuel, the knock retard (KR) will kick in which will alter spark advance and timing to compensate. The end result is degraded performance. Extended occurrences may result in engine damage.
I've heard of GTP owners using mid grade unleaded but they put in spark plugs that are a range colder. Personally, I'd stay with 91 octane or better.
Thrasher CAI, DHP v1.0 PCM,
3.25 SC pulley, CAIT GMAF, Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 TB,
TB spacer, MSD 8.5mm wires, Autolite 104s,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials