I thought the reason to stay away from high SAPS oils in GDI engines was because it gets vaporized and enters the intake tract via the PCV system and potentially causes LSPI and intake valve deposits.I can't see it being a problem as long as the engine does not burn oil.
LPSI, for those who don't know is low speed (rpm) pre ignition. In other words, it has the same affect as having the spark timing too far advanced. The peak cylinder pressure will occure too soon and likely be too high in this case.I thought the reason to stay away from high SAPS oils in GDI engines was because it gets vaporized and enters the intake tract via the PCV system and potentially causes LSPI and intake valve deposits.
Any engine can have its catalytic converter poisoned by SAPS products if oil is getting burned.
API SN max ash is 1.00%. Since your converter question was answered the other thing you didn't mention is buildup within the intake tract/valves.hi all,
is sulfated ash (SA) content of a 1.22 is to high for a gdi engine that require an api sn oil?
can it damage the converters?
tnx.
I would ask Amsoil.i will tell u whats my concern.
i own a gdi(non turbo) 16.5 mazda cx5.
i do 7500k miles a year of mostly very short trips,i wanted a robust oil that will handle once a year oci under those circumstances so i went with the ss by amsoil,now 7months later i discovered that the s.a is very high.
is it safe mostly converter wise?
had to replace 2 of them in my previous car(09 cts) so have a slight trauma.
tnx to all.
Just to be clear, the ash in motor oil is not "sulfated" ash, the sulfated part comes from the analysis method used by the ASTM test. The problem with catalytic converters comes from the phosphorus in oil but only if the oil makes it to the converter in the first place. If you're not burning a lot of oil then it does not matter.i will tell u whats my concern.
i own a gdi(non turbo) 16.5 mazda cx5.
i do 7500k miles a year of mostly very short trips,i wanted a robust oil that will handle once a year oci under those circumstances so i went with the ss by amsoil,now 7months later i discovered that the s.a is very high.
is it safe mostly converter wise?
had to replace 2 of them in my previous car(09 cts) so have a slight trauma.
tnx to all.
LSPI event is limited to turbo engines not naturally aspirated engines. And not all turbo engines are susceptible to it. European turbo engines are best when it comes to resistance to it. And it happens in small-displacement engines, mostly below 1.8ltr.I thought the reason to stay away from high SAPS oils in GDI engines was because it gets vaporized and enters the intake tract via the PCV system and potentially causes LSPI and intake valve deposits.
Any engine can have its catalytic converter poisoned by SAPS products if oil is getting burned.
i did but amsoil would say its ok because they sell it,im looking for unbiased facts.I would ask Amsoil.
Preferably - you want to be under 1.0 in SA content for GDI engines as well as select a synthetic oil that uses less Viscosity Index Improvers (VII's) .hi all,
is sulfated ash (SA) content of a 1.22 is to high for a gdi engine that require an api sn oil?
can it damage the converters?
tnx.
How did you ascertain the % of VII?Preferably - you want to be under 1.0 in SA content for GDI engines as well as select a synthetic oil that uses less Viscosity Index Improvers (VII's) .
Two of the better choices are Valvoline Advance Synthetic and next would be Pennzoil Platinum. Both are less than 3% VII content however the Valvoline Advance is near 1.0 in SA while the PP is lower at approx. .08 SA A 3rd choice (although slightly higher at 5% VII) is Quaker State Full Synthetic .
Any idea on Mobil product specs? Sorry new to this stuff if already discussed.Preferably - you want to be under 1.0 in SA content for GDI engines as well as select a synthetic oil that uses less Viscosity Index Improvers (VII's) .
Two of the better choices are Valvoline Advance Synthetic and next would be Pennzoil Platinum. Both are less than 3% VII content however the Valvoline Advance is near 1.0 in SA while the PP is lower at approx. .08 SA A 3rd choice (although slightly higher at 5% VII) is Quaker State Full Synthetic .