Originally Posted By: 901Memphis
Nothing wrong with mixing if you are doing modest intervals, but Ashland products would dilute the wonderful sopus products calcium content since they use sodium.
Additive packages are balanced by each blender, so it's a good idea to mix within the same brand but it won't hurt anything except your TBN. This would only be apparent on extended drains.
Everything varies by application but all api sn oils are miscable.
Of course that doesn't mean that differently formulated additive packages achieve the same desired results when blended. However, you've got to at least expect that the result should be close to desired with the remaining 0.5-1 quart of oil left in an engine during an oil change mixing with a different formulation during an oil change.
I suppose you could say the same thing about gasoline when mixed, but the fuel itself is pretty much a fungible commodity that mixes well. And most detergent packages these days are PEA and reasonably work together to achieve the desired results even if they're not exactly the same.
However, I remember buying some Kendall 10W-30 of the same API spec sold on the same shelf at a Pep Boys. They came from different lots and anyone who has opened motor oil bottles over the years could tell they were different by the color and smell. Two bottles were "sweet" smelling - almost the honey-like odor I remember from Mobil 1 for years. The other two bottles were acrid smelling - a lot like most current motor oils. There was obviously something different about these even though the bottle designs were exactly the same, including a sticker that said it met the latest API spec (one more than the spec on the "donut").
Nothing wrong with mixing if you are doing modest intervals, but Ashland products would dilute the wonderful sopus products calcium content since they use sodium.
Additive packages are balanced by each blender, so it's a good idea to mix within the same brand but it won't hurt anything except your TBN. This would only be apparent on extended drains.
Everything varies by application but all api sn oils are miscable.
Of course that doesn't mean that differently formulated additive packages achieve the same desired results when blended. However, you've got to at least expect that the result should be close to desired with the remaining 0.5-1 quart of oil left in an engine during an oil change mixing with a different formulation during an oil change.
I suppose you could say the same thing about gasoline when mixed, but the fuel itself is pretty much a fungible commodity that mixes well. And most detergent packages these days are PEA and reasonably work together to achieve the desired results even if they're not exactly the same.
However, I remember buying some Kendall 10W-30 of the same API spec sold on the same shelf at a Pep Boys. They came from different lots and anyone who has opened motor oil bottles over the years could tell they were different by the color and smell. Two bottles were "sweet" smelling - almost the honey-like odor I remember from Mobil 1 for years. The other two bottles were acrid smelling - a lot like most current motor oils. There was obviously something different about these even though the bottle designs were exactly the same, including a sticker that said it met the latest API spec (one more than the spec on the "donut").
