This is something I've been meaning to ask for a while. What is it that affects an oil's so called "cleaning ability"?
On the one hand, you've got PYB which claims to clean up to 40% of engine sludge by the end of the oil change with its Group II+ base stock. On the other hand, you've got something like Motorcraft or Kendall synthetic blends meeting the same specification (for the sake of argument say SN/GF-5) with a Group II/III mix that don't make any cleaning claims. Then you have something like Pennzoil Platinum, and HDEO's using Group II base stocks that are diesel rated with higher levels of detergency to combat soot.
On the other end of the spectrum, you've got Pennzoil Ulta with its GTL base stock and then something like Redline with its Group V esters.
In the first instance, I would assume cleaning ability has more to do with the add pack than the base oil, whereas in the second, purely the base stock. Would this be a correct assumption?
Also, what additives would be considered "active cleaning agents" as described by SOPUS that would be nice to have higher doses of?
Not to start a debate or anything, but I'm really looking for some factual answers out of curiosity.
On the one hand, you've got PYB which claims to clean up to 40% of engine sludge by the end of the oil change with its Group II+ base stock. On the other hand, you've got something like Motorcraft or Kendall synthetic blends meeting the same specification (for the sake of argument say SN/GF-5) with a Group II/III mix that don't make any cleaning claims. Then you have something like Pennzoil Platinum, and HDEO's using Group II base stocks that are diesel rated with higher levels of detergency to combat soot.
On the other end of the spectrum, you've got Pennzoil Ulta with its GTL base stock and then something like Redline with its Group V esters.
In the first instance, I would assume cleaning ability has more to do with the add pack than the base oil, whereas in the second, purely the base stock. Would this be a correct assumption?
Also, what additives would be considered "active cleaning agents" as described by SOPUS that would be nice to have higher doses of?
Not to start a debate or anything, but I'm really looking for some factual answers out of curiosity.