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>My opinion: Modern Synthetic's still leave hot spots from poor heat transfer. That combined with the detonation low octane gas caused your piston to crack or just burn through. not the first synth motor to become a Holey one. Course you listed many other contributors too... Keith I always use Semisynthetic 20W-50 motor oil and the dipstick is just > warm to the touch. The #4 cylinder is not scuffed and the piston > does not look burned at any other area other than the > hole part which is located on the down side of the piston face, > maybe something fell in and poked a hole in the piston thus > starting all this additional piston damage, this would account for > the bottom of the piston face damage, like the object > dropped to the bottom via gravitational pull. ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org