Ian
Notorious member
Jon, never heard of that, just the musings of a grease monkey with an engineering background and WAY too many product training classes in his past. Like was mentioned, if you want to get the zinc dosage that old STP used to provide in the late 1960s, one way is to use a concentrated racing oil additive or break-in additive for non-emission engines instead of today's STP (which ain't what it used to be, by a long shot). If you want the sticky-stringy effect, use a little Motor Honey, bar and chain oil, Lucas, or Morey's.