Quote:
Originally Posted by caddiali
No turbo, I was wondering if the GS Regal requires 94 octane or higher....Btw are those supercharged versions fairly reliable?
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On the L67 supercharged version of the Series II 3800 engine no matter which GM make/model car you should use 91 octane or better premium unleaded gasoline. To prevent detonation which will cause knock retard and possible internal engine issues later on. Regular unleaded can be used but for emergency or unusual circumstances only or short period of time only.
The L67 is just as reliable as the L36 NA version. It doesn't have the infamous UIM issues, however, may get LIM gasket issues. My '97 Grand Prix GTP has the L67 and it is extensively modded with 96K miles and still running strong after 13 years of ownership. Also, I had a '01 Regal GS for several years with no engine issues but sold that last year.
Plus all L67 equipped GM cars have the 4T65E-HD version of the 4T65E autotransaxle.