Originally Posted By: cb_13
Originally Posted By: mechanicx
I call group I,II and think II+ mineral or conventional. I call group III, III+ etc synthetic
. Isn't that how the oil companies call it as well?
Does a conventional SM or SN but non-ILSAC like 10W40 or 20W50 contain only group II?
To get back on topic, Pennzoil and all the major brands would be better than Supertech. Supertech meets the specs but is more like a bulk oil IMO.
So are you saying that oil that comes in 55 gallon drums is of lesser quality than oil you go into a parts store and buy a quart of? Why is it that so many people believe this to be true?
Because there are oils not just in bulk but various packaging that while meeting SN/GF5 just meet it and can have a different additive pack with less calcium etc than the major premium brands. At least that was the case under SM but I haven't checked recently.
Originally Posted By: mechanicx
I call group I,II and think II+ mineral or conventional. I call group III, III+ etc synthetic
Does a conventional SM or SN but non-ILSAC like 10W40 or 20W50 contain only group II?
To get back on topic, Pennzoil and all the major brands would be better than Supertech. Supertech meets the specs but is more like a bulk oil IMO.
So are you saying that oil that comes in 55 gallon drums is of lesser quality than oil you go into a parts store and buy a quart of? Why is it that so many people believe this to be true?
Because there are oils not just in bulk but various packaging that while meeting SN/GF5 just meet it and can have a different additive pack with less calcium etc than the major premium brands. At least that was the case under SM but I haven't checked recently.