i been reading more closely at these fuel additives. it seems to me neutra 131 does just about everything that most additives don't...any comments? i was disappointed when i re-read that fp60 wasn't an ucl and does not mention anything about neutralizing acids and most of all, as bob says, it is ashless leaves 0%residue...one can read all this info from the excellent schaeffer web site...lubecontrol has nothing to look up tech. info..and it seems to be a secret and i wonder why no one has ever done a vigin oil sample on fp60..there is one on lube control...this is just my opinion..please educate me...thanks all....if all my findings come to past i will cont. to only use neutra 131 in both of my fuel and engines..i leave the neutra in my engine the entire oil change cycle..