Amsoil 5w20 S.S. SN Good to Protect Against LSPI ?

[zeroptzero]

I picked up a stash of Amsoil SS in 5w20 viscosity, I believe it is an SN oil. There is a bunch of nomenclature denoting Dexos 1 gen 1 and gen 2, but I want to make sure it is a good oil to protect against LSPI ? My Subaru BRZ has dual fuel injection (port and DI ) which I like, but I am still concerned with LSPI, the engine is not boosted but it has a high compression ration (12.5:1 ?) I like this oil for the low NOACK and I was able to get it at a discounted price. What do you guys think ?

 

[Titan]

Do you have evidence that this engine is prone to LSPI? It sure doesn't fit the stereotypical profile.

 

[zeroptzero]

Do you have evidence that this engine is prone to LSPI? It sure doesn't fit the stereotypical profile.

Good question, I do not. You are right as it is not turbocharged, it is Direct Injected (partial) and high compression. Probably not an issue with this engine ?

 

[parshisa]

send it!

 

[Titan]

Good question, I do not. You are right as it is not turbocharged, it is Direct Injected (partial) and high compression. Probably not an issue with this engine ?

My main point is simply that it doesn't fit the characteristics of an engine prone to LSPI issues. A secondary point is that 12.5:1 isn't "high compression" compared to a boosted engine. I would be extremely surprised to learn this engine is prone to LSPI.

 

[zeroptzero]

My main point is simply that it doesn't fit the characteristics of an engine prone to LSPI issues. A secondary point is that 12.5:1 isn't "high compression" compared to a boosted engine. I would be extremely surprised to learn this engine is prone to LSPI.

Thank you, that is reassuring information, I appreciate the replies on this.

 

[Klutch9]

My main point is simply that it doesn't fit the characteristics of an engine prone to LSPI issues. A secondary point is that 12.5:1 isn't "high compression" compared to a boosted engine. I would be extremely surprised to learn this engine is prone to LSPI.

12.5:1 compression on a naturally aspirated engine is still higher compression than a turbo engine running, say, 10.0:1 compression. The turbo engine can have higher cylinder pressure under boost, but the NA engine in this scenario still has a higher compression ratio.

That being said, high compression alone does not make an engine LSPI prone. I believe it’s typically the high cylinder pressures that turbo engines have, under low rpm/high load (boost) that can cause detonation.

 

[TurboZedd-R]

Id say Amsoil is one of your best bets in most categories. Regardless of oil just don't lug the car

 

[Titan]

12.5:1 compression on a naturally aspirated engine is still higher compression than a turbo engine running, say, 10.0:1 compression. The turbo engine can have higher cylinder pressure under boost, but the NA engine in this scenario still has a higher compression ratio.

That being said, high compression alone does not make an engine LSPI prone. I believe it’s typically the high cylinder pressures that turbo engines have, under low rpm/high load (boost) that can cause detonation.

Agree totally. The higher combustion chamber pressure is what increases the risk to boosted engines under low RPM/high load. A compression ratio of 12.5:1 in a naturally aspirated engine has a lower combustion chamber pressure than a highly boosted engine with a lower compression ratio...the increased LSPI risk is mainly due to the higher combustion chamber pressure (as well as Air-fuel ratio and oil slipping by the rings).

 

[zeroptzero]

Thanks for all of the replies on this, good information to have, and good to know LSPI is not a concern.