Rotella T6. Oops, sorry that"s my motorcycle forum oil thread answer, but I have used it in a pinch at the range when I forgot my kit. I've been using Breakfree CLP for about 30 years because I bought a gallon jug of it way back then and it still has a little in it. I have to pour some in a container and but it in my vibratory tumbler before refilling my squirt bottle as it settles and clumps. I have noticed that the new Breakfree doesn't have that aroma I learned to love like the old stuff has.