I was using Klotz Benoil, but switched to Lucas recently, The price, positive results with their other products and their support of the sport was my reason for the switch.
I have found that the Lucas doesn't produce as much smoke or as thick of a spooge as the Klotz, even at 32:1, I was running the Klotz at 50:1.
The Spooge also cleans up easier, I wash my bike with Shout (laundry detergent) and the Lucas spooge hoses right off, whereas the Klotz would take contact cleaner and some scrubing.
The lucas is $6 a quart opposed to $9 a pint for Klotz, the drawback is that it doesn't smell like Klotz or castor, but I don't ride behind myself so whatever.
I got 80 hours on my last top end(KX250 woods riding)using klotz at 50:1, I will let you know how my new top end does with the klotz at 32:1, I pull off the intake and measure the endgap of the rings every 20 hours.