"Long term" HPL users: feedback/thoughts/analysis

[Titan]

Is there any risk with the cleanup of carbon from rings that it could break off and hurt the valves?

By my calculations: 0.0000002303% chance.

 

[D1dad]

You are dumping premium and premium plus at 6k?!?!

No. I’m dumping the premium in my 21 which was the 1st hpl run in a 45k engine that always had 5k changes using clearance idemitsu. I didn’t do any sort of engine cleaner so I assume it did some cleaning I didn’t expect was needed. Hpl or not, it’s still a direct injected engine. The premium plus was installed on a brand new engine and has similar miles on the oil but is still pretty much spotless. The 21 oil is nasty and reeks of fuel. Plus I did a redline fuel system cleaner on the last full tank. Schaeffers is going in for the winter and then I’m going to run hpl next spring/ summer for a full 10k.

 

[TiGeo]

Here's some interesting data I just got back:

https://bobistheoilguy.com/forums/t...08k-8k-oci-hpl-euro-5w40-8-track-days.389580/

 

[thetricky]

No. I’m dumping the premium in my 21 which was the 1st hpl run in a 45k engine that always had 5k changes using clearance idemitsu. I didn’t do any sort of engine cleaner so I assume it did some cleaning I didn’t expect was needed. Hpl or not, it’s still a direct injected engine. The premium plus was installed on a brand new engine and has similar miles on the oil but is still pretty much spotless. The 21 oil is nasty and reeks of fuel. Plus I did a redline fuel system cleaner on the last full tank. Schaeffers is going in for the winter and then I’m going to run hpl next spring/ summer for a full 10k.

Ah gotcha, makes sense. Remember this is also a fantastic oil to resist fuel dilution while safely running longer change intervals for GDI situations.

 

[TiGeo]

Ah gotcha, makes sense. Remember this is also a fantastic oil to resist fuel dilution while safely running longer change intervals for GDI situations.

Nto sure I agree with "resist fuel dilution" - no oil can do that, it's just a physical lowering of the viscosity mixing the low vis gas with the oil. What you may mean to say is while no oil can resist fuel dilution, the HPL products have great VIIs that resist mechanical shearing. Most oils in the UOAs I see from turbo GDIs likely have a combo of both going on so that the resultant lower vis you end with would be higher with HPL b/c of the lower amount of shearing. You can see my UOAs for examples.

 

[thetricky]

Yes i get it is still physically diluting the oil with a very low viscosity fluid, no way around that. With very stout base oils and, as you said, the great VII’s used it is an oil better suited to resist that thinning effect of the oil film. Hopefully that’s a better explanation of my thoughts!