Originally Posted By: Triple_Se7en
Originally Posted By: BikeWhisperer
Originally Posted By: SirTanon
MANY years ago, PYB was notorious for 'sludging up' and unfortunately you still hear people saying that it does.
The PYB you get now is nothing like what that stuff was. The current PYB is amazing stuff and cleans very well. Use with confidence.
Yep, I actually removed a valve cover off an engine that the owner proudly proclaimed used Pennzoil only changed every 3k miles back in the early 90's. It was sludge'd up quite a bit.
But their SOPUS product is top notch, better base stocks and great additive packages.
Most likely engine design or oil contamination with either fuel or coolant caused that sludge. It sure wasn't Pennzoil, which has been #1 selling for a long-long time now........ as far back as Arnold's tractor on TV.
Maybe it was Pennzoil, maybe it wasn't but I do remember hearing that it sludge'd engines well before I came across it. Maybe the owner lied and changed it every 12k instead or maybe it was a sludger engine. I don't remember the specifics other than seeing it and remembering what other mechanics had said about Pennzoil.