Originally Posted By: bigj_16
VP, what is the oil recommendation on the Subies in the recall? Two things on the Hyundai site. They were pointing possibly to high silicon. I have never seen mentioned in studies. They are also saying PAO's are more resistant to LSPI, whereas the one study I saw said the likliness of an LSPI event actually increase as oil group increases, numerically, with the exception of Group V.
I noticed that same thing about group IV/V in the Infineum paper, but that paper seems to be strangely inconclusive about actual LSPI events. It acknowledges that there is proof that calcium is an LSPI promoter, but then says that it made no difference in autoignition for the gaseous phase testing that was being performed. The summary of findings at the end suggests that testing of the effects of solid deposits might need to be done to understand the well known calcium connection.
Given that other studies in real engines have shown that higher group oils generally perform somewhat better than lower group ones, I tend to wonder how useful these IQT tests really are.
http://www.infineuminsight.com/insight/jun-2017/lspi-and-lubricant-auto-ignition
Is there any retail oil out there that is know to be largely ester based? Are Redline oils supposed to be 100% ester base stocks?
VP, what is the oil recommendation on the Subies in the recall? Two things on the Hyundai site. They were pointing possibly to high silicon. I have never seen mentioned in studies. They are also saying PAO's are more resistant to LSPI, whereas the one study I saw said the likliness of an LSPI event actually increase as oil group increases, numerically, with the exception of Group V.
I noticed that same thing about group IV/V in the Infineum paper, but that paper seems to be strangely inconclusive about actual LSPI events. It acknowledges that there is proof that calcium is an LSPI promoter, but then says that it made no difference in autoignition for the gaseous phase testing that was being performed. The summary of findings at the end suggests that testing of the effects of solid deposits might need to be done to understand the well known calcium connection.
Given that other studies in real engines have shown that higher group oils generally perform somewhat better than lower group ones, I tend to wonder how useful these IQT tests really are.
http://www.infineuminsight.com/insight/jun-2017/lspi-and-lubricant-auto-ignition
Is there any retail oil out there that is know to be largely ester based? Are Redline oils supposed to be 100% ester base stocks?