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RLI also makes a 10w30 HD oil which would not be as energy conserving as the 0w30, but it might be a compromise between the 5w40 and the 0w30 which would work ok in warmer weather. In a cold climate the 5w40 would give better flow at startup in winter.

5w30 is the correct oil, but I have seen much better results than these using Mobil 0w20 for 15k. Also my Prius suffered from fuel dilution which Blackstone did not detect so I switched to RLI 0w20. I also tried Penzoil Platinum 5w20 and it worked pretty well. You should probably try Pennzoil...

Keep in mind that the virgin RLI 0w30 has a starting TBN of around 6, you will do much better with the TBN of the 5w40 HD which starts at around 12 in its unused state.

I have used Blackstone and thought they were pretty good. Then some one mentioned that they had a fuel dilution issue in their Prius and I sent a sample to Terry Dyson to check things out. I did have fuel dilution which I was missing at Blackstone. So I agree with those people who suggested...

Have you considered trying the YB5w20 just to see how it does? It might look as good as or better than the yb5w30. At 5k ocis this would save you a couple of bucks. When you are past the powertrain warranty (60k/5years I think) you could stretch the oci, if you choose and then PP makes more sense.

How many miles on the engine when this uoa was done? How many oil changes on the engine so far? Very nice result.

I also don't understand the switch to 5w30. No doubt the oil change was performed before seeing these results. A run of YB5w20 might be interesting because the YB5w30 did so well. If it were my car I would stick with the PP because you will have a cleaner engine. Once you get to the 36 mo or 60k...

Lots of info here. Can you tell us what oil was used from left to right? Nice result.

I would try RLI 5w40HD, better yet send your next sample to Dyson Analysis and get a professional's opinion.

Hi Built-Well, This is a pretty standard Blackstone evaluation of high lead. Note that they are not as worried as you are about the high TAN. When I have had questions about a Blackstone analysis, a phone call has usually been most helpful. They will often re-run a questionable number like your...

You also might ask Blackstone to retest the TAN. Labs sometimes make mistakes. I have used RLI 0w20 for many changes on a 2004 Prius and have had very good results. If you consult Terry Dyson it is much cheaper to do it directly rather than through Blackstone.

Did this guy ever buy the oil and do a UOA?

Why not try the YB 5w20? I know that Bill in Utah gets awesome results with the 5w30, and these results are stellar as well, but this is an 07 which is spec'd for 5w20. Maybe the yb 5w20 will do even better? Worth a shot in my opinion, but its not my car. Also the PP did not do as well which...

I agree with Bill, wait until 60k to extend your oci. Also the Prius tends to suffer from fuel dilution so extended intervals are not a great idea. An analysis by Dyson Analysis may not be a bad idea. Also the RLI 5w30 (I use the 0w20 but I have 100k on my 2004) might help with fuel dilution and...

Not familiar with the warranty on this car, but if its the usual 60k for powertrain. I would do another 10k interval for warranty reasons and then try 15k, then 20k on the PP and maybe try an Amsoil or Mobil 1 oil filter for the 15k or longer intervals. 20k over 4 months looks very possible with...

I wouldn't worry about the "high" Cu. In some cases Cu is in the wear additives. I agree that another 3-4000 miles would be fine, but it is not my car. If the Cu is an oil additive you will see the level remain the same or possibly drop on your next analysis. You might even consider doing the...

Try the Mobil, it should be fine, especially at 5k oci.

I agree with those who suggest changing out the oil. A run out to 15k would be interesting, but it is not my car. I doubt running it a few thousand more miles would hurt anything, but if you do not plan to do another analysis at 15k, just dump it now to be safe.

Looks pretty good. The low miles indicate severe service, so you might want to back off to every 6 months, you could probably use a good dino (to save a few bucks)or try a full synthetic(Mobil 1 or Penzoil Platinum) if money is no object just to see if there is any difference, but the MC would...

I would agree with running shorter intervals. Nitration should be 10 or less. With lead that high I would be sending a sample to Dyson Analysis. Also looking at the linked data, the nitration and viscosity seem to increase as the oci is lengthened so it may be the nitration leading to...