What do you think of my blend?

[supercity]

75% Penrite 0w50
25% Penrite 0w20

Specs would be

KV40 79.9cst
KV100 14.18cst
HTHS 3.9 (my guess)
Viscosity Index 185

The goal is a 0w40. In Australia this would cost about 3/4 of the price of Mobil 1 0w40

 

[A_Harman]

Sounds pretty good.
Doesn't Penrite make a 0w40?

 

[CATERHAM]

Yes I agree it sound pretty good, and would be an option I would pursue since it is so much cheaper than the imported M1.

If you do have an oil pressure gauge on your car I would fine tune the actual mix based on your actual OP values.

 

[LeakySeals]

Not to hijack but somewhat related...I asked about a M1 0w50/0w20 blend once, somebody told me you cant do that, its no good, its a racing oil, damage the engine, etc. Comparing to the OP, is this just a case of different oils/different countries?

 

[CATERHAM]

LeakySeals no problem at all, but keep in mind how high the Phos level is of M1 R 0w50. The only reason to use their 0w50 vs M1 0W-40 is that you want a higher P and Moly level. So depending on how heavy a blend, I would recommend including M1 0W-40 to limit the AW level.
Also remember that the 0w50 and 0W-40 have the same HTHSV (assuming Mobil's published spec's are correct which I doubt btw), so blend for a final desired HTHSV not KV100.

 

[LeakySeals]

Thanks. Ties into the part I cant understand - SN is worried about catalyst life (amongst other things). HM oils contain extra wear additives, used on the engines that burn (on avg guesstimate) more than double the amount of oil new engines. The HM oils can't make SN for these reasons. So.. Its safe to assume that the oil brew was seeking another year or 2, it really doesn't matter other than good flow from say, M1 HM 5w20, TGMO 0w20, or a racing M1 0w50?

 

[CATERHAM]

In an engine that doesn't burn much oil I thick you can go as high as RL levels of P without worrying about shortening the life of your cat'.
Of course the first question should be how much extra P do I really need in a late model car? IMO 1,000 ppm is plenty so I wouldn't use much more than quart of M1 R 0w50 in any blend.

 

[supercity]

Originally Posted By: A_Harman
Sounds pretty good.
Doesn't Penrite make a 0w40?


Strangely they don't.

They use to make a C3 0w40 but they changed it to a 5w40, maybe to get Dexos2 approval?

 

[LeakySeals]

Thank you. Lastly... Whats needed primarily in HM engines is rubber seal swellers. People (me anyways) are concerned about (for example) Maxlife dumping the wear adds to become SN compliant for sales in newer engines. The question is.. are we finding the better flow compensates for wear additives?

 

[supercity]

Originally Posted By: LeakySeals
Not to hijack but somewhat related...I asked about a M1 0w50/0w20 blend once, somebody told me you cant do that, its no good, its a racing oil, damage the engine, etc. Comparing to the OP, is this just a case of different oils/different countries?


M1 R 0w50 is a low/non detergent oil. It is very different to M1 0w20 so depending on the blend, the suitable applications maybe limited.

Penrite 0w20 and 0w50 are detergent oils with the same high AW additive package. We are led to believe the only difference is the viscosity and that 0w50 must have some added VIIs.

 

[CATERHAM]

It would be helpful if Penrite provided NOACK and HTHSV spec's as we would know more about the base oils used.

As a point of interest, I'm actually using about 11% Sustina 0w50 blended with the 0W-20 in my Caterham to thicken it up a bit. We (dparm actually) had a VOA done on the 0w50 to learn more about it, and found out it is actually only a 0W-40; and the VI is only about 178.
Many heavier low volume formulations differ significantly from their claimed PDS spec's.

You may what to have a VOA done on the 0w50 but only if they with test for both KV40 anbd KV100.

 

[rrounds]

I use a 50/50 mix of M1 0/50 and M1 0/20 AFE in my S2000. I do this for the extra protection that the higher levels of P/Z in this blend of oil affords me plus the much higher moly count. I have seen way too many F20 and F22 engines score the cyl. and/or piston from lack of high speed lubrication.

I have a little over 26k miles on this mix and it works for me. If my engine used oil(mine uses less than 1/4 qt. in 7500 miles) I would not use it in a 50/50 mix but in a 40/60 mix. My engine sees 8400 rpm at least once just about every day. Its fun to hear it wind out getting on the freeway.

We have had our S in some very high temperatures, just last week we went on a 700 mile drive in 105+ degree temps.(topped out at 110). We drove on roads that had up to 26 degree of slope and that makes this little 2.2L engine work very hard and the only way to get any power out of it is to spin it up over 6500 rpm. That is why I use this mix of oil, I don't want to see my engine wind up like so many others. Needing new pistons or a whole new engine.

ROD

 

[supercity]

Penrite give away a lot of info in their MSDS, I think these oils are 30-60% PAO

The old PDS of Penrite 0w50 list HTHS at 4.4 which is pretty normal for a 50 grade.
Although KV values are the same, they have omitted the HTHS from the current PDS for some reason, maybe to fall inline with all the new viscosity offerings which have probably not had tested.

The 0w20 is very light with a KV100 of 6.7cst so I would think HTHS it would be close to 2.6 but I guess because it has no VIIs it could be a lot higher.

Peronally I take Blackstone's KV100 figures with a grain of salt. I don't believe virgin Sustina 0w50 would be out of grade.

 

[Pilfer]

I just use their 10w-40 racing oil. It is not like we need the 0w feature in Australia, except for the oil being thinner at startup. Take a look at the specs though. At 40C the 10w-40 is 92VI and the 0w50 is 108VI, the 10w is the thinner oil when cool. Also the 10w-40 has the advantage of no VII and doesn't shear.

 

[supercity]

I emailed Penrite tech asking what they thought of my blend and although they didn't recommend against it, the short story was "Don't bother, it wont work in the way you have in mind"

 

[Pilfer]

I have emailed the Penrite tech questioning the oil recommended for my car. They had a 15w50 recommended (the thickest option in the manual or a 15w40. I asked about the 10w40 and the response was "We recommended using a 15w oil as that is what holden spec'd". I wondered about the quality of their tech guys knowledge and ignored it.

 

[CATERHAM]

Originally Posted By: supercity
Penrite give away a lot of info in their MSDS, I think these oils are 30-60% PAO

The old PDS of Penrite 0w50 list HTHS at 4.4 which is pretty normal for a 50 grade.
Although KV values are the same, they have omitted the HTHS from the current PDS for some reason, maybe to fall inline with all the new viscosity offerings which have probably not had tested.

The 0w20 is very light with a KV100 of 6.7cst so I would think HTHS it would be close to 2.6 but I guess because it has no VIIs it could be a lot higher.

Peronally I take Blackstone's KV100 figures with a grain of salt. I don't believe virgin Sustina 0w50 would be out of grade.

We did have Blackstone retest their figures and and it wasn't much higher the second time around. We also sent a copy of the VOA to Sustina for an explanation and they did not deny the results.
An accurate KV test is not difficult to make, so yes I tend to believe Blackstone. As I mentioned, some companies have quality control issues particularly with low volume batches of heavier oil grades and Blackstone has made the same observation.