I've been in the local auto parts store many times and played with the "Luca Oil" additive display. It seems to really cling better to the moving parts leaving a thicker protective layer. Now I haven't been able to determine if their product is a synthetic or not...but I wonder if anyone here has an opinion on whether or not this would be beneficial in a motor that is already running synthetic? I've used Mobil 1 and Amsoil products since I finished my breakins and change oil every 7500 miles with filter changes at 3800 miles...when I rebuilt my motor this winter at 24000 miles to put in a big bore...the cyllinders looked brand new and there was no varnish or gummy buildup anywhere...I'm sold on SYN
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