Pennzoil Platinum 5-50

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SargeGTO

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My local NAPA has quite the "top shelf" oil lineup. Today I saw Pennzoil Platinum 5-50. Did a double take thinking it was 5-20. But no. They had PP 5-20/5-30/10-30/5-40 and 5-50.
Cannot find any info on PP 5-50 on the Pennzoil website and searched here and on the web. Anybody have any info as to the cSt/HTHS numbers or makeup?
 
I recently saw PP 5w50 at Pepboys. I did a double take because it seemed odd in this 'thin oil' era.
 
Sarge, good choice with the Amsoil 20w-50. The PP 5w-50 whould shear like crazy. The one size fits all grades like the 0w-40's and 5w-50's are really not the best oils to use for high performance engines IMO.
 
Just curious, but why would the 5-50 shear like crazy?
I have been thinking about using this or Castrol's Syntec 5-50 in my 2.9l Bronco2.
(i'm currently using RoyalPurple 10-40)
It would seem the 5w would be better during startup, and the 50w would help low pressure engines like the 2.9l to keep oil pressure high?
Thoughts?
 
Quote:

Just curious, but why would the 5-50 shear like crazy?
I have been thinking about using this or Castrol's Syntec 5-50 in my 2.9l Bronco2.
(i'm currently using RoyalPurple 10-40)
It would seem the 5w would be better during startup, and the 50w would help low pressure engines like the 2.9l to keep oil pressure high?
Thoughts?

Click to expand...

I totally agree. I believe some may adhere to the old VII ability to hold viscosity. I remember when the first multi viscosity oils came out and we were all pouring straight 40 weights in our sumps
smile.gif
Everybody thought there was no way in heck a 10-30 was gonna do anything but burn our motors up. Don't get me started on going from bias ply tires to radials....they ( the radials) wouldn't hold air...anybody could see that! They all looked flat
smile.gif

As we all know...these modern oils are a miracle of science...having come from Sinclair/Texaco/Quaker State/Pennzoil 40 weights of the 60's to todays Dino/blend/full synthetics...I can say without hesitation....any of todays oils beat those of just 30-20 years ago hands down. I mean Wally World oil is a major league step forward in comparison. OK...I rambled enough:)
My point is....PP 5-50 is some "different" stuff I beleive...seems all the major oil producers are tweaking and changing their brews.....why wouldn't VII capabilities be part of the forward progression of improvements? I'll buy some of this shear ready PP....abuse the heck out of it...and get a UOA and we'll see where we stand...Thanks guys for your responses....I do like the HTHS/cS looks of this stuff though...curious of the make up....I'll find out the old fashioned way....I'll abuse it and send a sample in
smile.gif
 
I cant figure out how to edit...oh well...I am old obviously...I meant to say.."some may adhere to the old VII inability to hold viscosity"....now where in the heck is the enter button on this thing?
 
The best way I've found to determine shear stability is to look at the ratio of kinematic viscosity @ 100C, to HT/HS viscosity @ 150C - the lower that ratio, the more shear stable the formulation will be.

Taking Dr. Haas' numbers, we have: 18.7/4.29 = 4.36

That's a horrible ratio and indicates this oil has lots of polymeric thickener and prone to shearing. I've posted lots of info on this subject, so I won't repeat it here.
 
SargeGTO,

For comparison, lets look at the Amsoil Series 2000 Racing Oil (TRO):

Vis @ 100C is 18.3 Cst
HT/HS is 5.1 Cp

Ratio is 18.3/5.1 = 3.6

You can tell without even running both these oils that the SAE 20w-50 is going to be MUCH more shear stable. This general trend will hold true for almost all 20w-50's, compared to the wide range 5w-50's.
 
Thank you TeeDub....I'll search your post and educate myself. Appreciate it. If you ever need a great BBQ rub just PM me...I'll share right back at ya.
 
It still would be interesting to see how your BBC chews up that 5w50.

On the other hand, living in "The Valley" I doubt it ever gets below 15°F so you could easily run the TRO 20w50 year 'round in the beast.
 
I was told by Amsoil tech service that the S2k line of oils contain more esters than the others. The Amsoil 20w-50 is a better choice then the PP as TeeDub stated. No polymeric thickeners.
 
Quote:

It still would be interesting to see how your BBC chews up that 5w50.

On the other hand, living in "The Valley" I doubt it ever gets below 15°F so you could easily run the TRO 20w50 year 'round in the beast.

Click to expand...

I dunno bout that...suppose to be in the 20's tonight and tomorrow
smile.gif
Palm trees gonna freeze! It's a global warming thing. Gonna drain and UOA the Amsoil. Run 2-3 runs of PP 5-50 and send the 2nd or 3rd PP5-50 run into #@$%! Labs.....then it will not be speculation or theory anymore....If it is even close...I'll go PP....We drain some oil around here and PP is just about half the cost of Amsoil....if it is even close....
 
Sarge, what about Redline 5w-40 or 10w-40? Sounds like your engine is ideal for that type of oil.
 
SargeGTO,

I have personally run the 20w-50/TRO formulation for 12,000-15,000 miles on several occasions and it was still in excellent shape. Amsoil is never gonna be your most cost effective choice for short service intervals, however.

I would point out that the 4.3 Cp, HT/HS viscosity of the 5w-50 is easily matched (or bettered), by many 5w-40 or 10w-40 synthetic oils. For example, the Amsoil 10w-40 Marine Oil and the Redline 10w-40 both come in at approx 4.6 Cp. I would expect both to provide better protection from wear/deposits than a wide range multigrade.

I honestly don't see that you gain anything from using a SAE 5w-50 in any application....

TD

ps: I may take you up on the brisket rub, since I do all the cooking here
 
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