Number of years ago, I freezer tested some FP10, slide-glide and 7808 turbine engine oil and found the 7808 to be hands-down the best of the bunch. Slide-glide basically froze, FP10 did well but the 7808 didn't loose anything. All 3 are fine lubes for what we use them for, but if you shoot in an area that has extreme low/high temps it's advantageous to find something that will work year round. 7808 does that for me.