Originally Posted by Gene K
Originally Posted by LubricatusObsess
Originally Posted by buster
Amsoil doubled the length of the test and claims 40% cleaner than required.
https://amsoilcontent.com/ams/ShopRes/products/900px/FF_Signature_Series_40_Percent_Cleaner.jpg
I see this is from Amsoil's latest API SP recipe, in their Signature Series (top of the line PAO / Group IV). I think that's a marketing mistake - engines are morphing into dirty pigs again with the advent of GDI. The very last thing you'd want to do is extend OCI's now - OCI is now determined on the oil's additive package's ability to suspend soot and fuel dilution until contamination limits are reached. Posters in BITOG are saying this is 5,000 miles or so.
What I'm interested in is optimized oil for the 5,000 mile OCI with GDI engines. Good DD add pack, good thermal stability - not the best that can be achieved. Signature is 3x the price of Group III's & GTL, only to be drained out. No longer worth it.
If we can suspend soot for 60,000 mi in a large diesel why would we only be able to accomplish it for 6,000 mi in a gasoline engine? Adjusting for sump volume and mpg that would be the equivalent of 30,000 mi in a Ford 5.0 GDI.
My thoughts would be that the big diesels tend to stay running and mostly highway use compared to more cold starts and short trips without the engine fully warming up etc. at the same time I do see your point too. I myself change way more than the average for sure usually always before 3000 miles.
Originally Posted by LubricatusObsess
Originally Posted by buster
Amsoil doubled the length of the test and claims 40% cleaner than required.
https://amsoilcontent.com/ams/ShopRes/products/900px/FF_Signature_Series_40_Percent_Cleaner.jpg
I see this is from Amsoil's latest API SP recipe, in their Signature Series (top of the line PAO / Group IV). I think that's a marketing mistake - engines are morphing into dirty pigs again with the advent of GDI. The very last thing you'd want to do is extend OCI's now - OCI is now determined on the oil's additive package's ability to suspend soot and fuel dilution until contamination limits are reached. Posters in BITOG are saying this is 5,000 miles or so.
What I'm interested in is optimized oil for the 5,000 mile OCI with GDI engines. Good DD add pack, good thermal stability - not the best that can be achieved. Signature is 3x the price of Group III's & GTL, only to be drained out. No longer worth it.
If we can suspend soot for 60,000 mi in a large diesel why would we only be able to accomplish it for 6,000 mi in a gasoline engine? Adjusting for sump volume and mpg that would be the equivalent of 30,000 mi in a Ford 5.0 GDI.
My thoughts would be that the big diesels tend to stay running and mostly highway use compared to more cold starts and short trips without the engine fully warming up etc. at the same time I do see your point too. I myself change way more than the average for sure usually always before 3000 miles.