Largely a repost of something from another thread, but I thought it was significant enough to be worthy of its own thread. Putting it in the gasoline forum as LSPI is a gas engine issue.
One thing that I just stumbled across online that made my jaw drop is a claim that the dexos2 spec includes an LSPI mitigation test like dexos1 Gen 2, despite the fact that LSPI is not a factor in diesel engines.
'At the UNITI Mineral Oil Technology Congress held in Stuttgart, Germany in April, Thomas Hickl, an engineer for Opel, outlined the evolution of General Motors’ dexos engine oil specification. He noted that lubricants for GM’s new dexos2 specification, which covers diesel engines, will have to pass a low speed stochastic pre-ignition (LSPI) test.
This will be true even though diesel engines don’t experience unpredictable pre-ignition, the hallmark of LSPI, while gasoline engines do. Why, then, does dexos2 even include an LSPI test?
“There can be non-technical reasons to require even things that are not necessary for a diesel engine, which is LSPI protection,” Hickl said.
The non-technical reason has to do with GM opting for a single specification in Europe, which will apply to both gasoline and diesel engine oils. This is because of the high percentage of light-duty diesel engines in Europe, unlike in the U.S., and GM’s move to simplify the supply chain. Elsewhere in the world, GM requires dexos1 for gasoline engines and dexos2 for diesel engines.'
https://fuelsandlubes.com/fli-article/the-new-gm-dexos2-its-complicated/
I had NO idea. All this time I've been pointing posters on here to dexos1 Gen 2 as the only active standard that tests for LSPI and I have been full of it.
DIT drivers looking for higher HTHS oils can apparently use dexos2 as a guide.
One thing that I just stumbled across online that made my jaw drop is a claim that the dexos2 spec includes an LSPI mitigation test like dexos1 Gen 2, despite the fact that LSPI is not a factor in diesel engines.
'At the UNITI Mineral Oil Technology Congress held in Stuttgart, Germany in April, Thomas Hickl, an engineer for Opel, outlined the evolution of General Motors’ dexos engine oil specification. He noted that lubricants for GM’s new dexos2 specification, which covers diesel engines, will have to pass a low speed stochastic pre-ignition (LSPI) test.
This will be true even though diesel engines don’t experience unpredictable pre-ignition, the hallmark of LSPI, while gasoline engines do. Why, then, does dexos2 even include an LSPI test?
“There can be non-technical reasons to require even things that are not necessary for a diesel engine, which is LSPI protection,” Hickl said.
The non-technical reason has to do with GM opting for a single specification in Europe, which will apply to both gasoline and diesel engine oils. This is because of the high percentage of light-duty diesel engines in Europe, unlike in the U.S., and GM’s move to simplify the supply chain. Elsewhere in the world, GM requires dexos1 for gasoline engines and dexos2 for diesel engines.'
https://fuelsandlubes.com/fli-article/the-new-gm-dexos2-its-complicated/
I had NO idea. All this time I've been pointing posters on here to dexos1 Gen 2 as the only active standard that tests for LSPI and I have been full of it.
DIT drivers looking for higher HTHS oils can apparently use dexos2 as a guide.