Re: intermittent oil loss
Smoke in the crankcase when you take the cap off is fine providing the engine was hot. Silicone won't stay on a warm engine very long. Give the engine a degrease with a pressure washer (under body too!) and you should be able to better pin point the leak.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!