Amsoil Signature or Pennzoil Ultra Platinum

corey148 · Mar 10, 2026

Good morning everyone,

Whats everyones thoughts about using Amsoil Signature Series 5W-30 vs Pennzoil Ultra Platinum? I currently use the Pennzoil Ultra Platinum and change the oil in my 2018 Ram 1500 every 5,000-6,000 miles and also use Lubeguard Bio/Tech Oil Protectant to help protect any issues with lifter failure. I plan to keep the truck until the wheels fall off of it lol. The Amsoil Signature Series is rated for 20-25k mile oil interval changes, but there is no way I would wait that long to change the oil. Is the added cost of the Amsoil Signature Series oil worth it or would I just be throwing money away and be better off continuing using the Pennzoil Ultra Platinum. Thanks!!!

DILLIGAF · Mar 10, 2026

Oil thread is here. Go read it.

Blackstone oil analysis

Decided to send in my first oil sample from my 2017 Ram 1500 Hemi w/ 125,686 kilometers (78,100 miles). Not bad numbers I'd say, what do y'all think.

www.ramforum.com

mikeru · Mar 10, 2026

corey148 said:
Good morning everyone,

Whats everyones thoughts about using Amsoil Signature Series 5W-30 vs Pennzoil Ultra Platinum? I currently use the Pennzoil Ultra Platinum and change the oil in my 2018 Ram 1500 every 5,000-6,000 miles and also use Lubeguard Bio/Tech Oil Protectant to help protect any issues with lifter failure. I plan to keep the truck until the wheels fall off of it lol. The Amsoil Signature Series is rated for 20-25k mile oil interval changes, but there is no way I would wait that long to change the oil. Is the added cost of the Amsoil Signature Series oil worth it or would I just be throwing money away and be better off continuing using the Pennzoil Ultra Platinum. Thanks!!!

I don’t disagree with @DILLIGAF that we don’t need another oil discussion thread. There is plenty of information out there to help you make an informed decision like this. I will ask this though…Why would you consider changing anything in your oil routine that you’ve been using for presumably eight years with success? I’ve seen a lot of advice given out over the years, and the one constant is always don’t switch oils. Don’t fall for marketing ploys.

Hawkman · Mar 10, 2026

I’m an Amsoil fan boy. Use it in our Ram, Durango, and the Harley. But like the other poster said. If you have been using Pennzoil all this time, and are happy with it? Why change now ?

Burla · Mar 10, 2026

10.3 visc 5w30 PUP higher viscosity index
10.3 visc Amsoil 5w30 ss

Both of these oils are known to have the lowest wear numbers. Viscosity for any 30 weight is from 9.3 and 12.5, meaning these are both thin 30 weights and the reason is they are spec SP/SQ. For example is you chose Amsoil 0w30 euro I believe MS or EOT call sign instead of the SS, the viscosity is 12.3, and is not SQ or SP but rather sn+, more importantly if you look into hths it is 3.5 which is redline territory. In other words, it's good isht, nearly 20% thicker and better cold flow. You chose a 5w30 for a reason my guess, but your choices are barely 5w30, too close to being a 20 weight. The Amsoil eot or m1fs in 0w30 or any euro an in 0w30 is going to out perform your choices, if you like brand you can stay with the Amsoil and just get the euro 0w30. If you insist in your two choices, I like PUP.

Rlaf75 · Mar 10, 2026

You've had good luck with pennzoil so I vote stay with pennzoil

huntergreen · Mar 11, 2026

Wouldn’t make sense to me to pay for an oil rated for 20000 oci and and dump it in 5000 miles unless penzoil has changed their formula.

Musky Mike · Mar 12, 2026

I wouldn't run either based on a data sheet, run them both and do an oil analysis, see which one has better results in your engine.

OFw Kalli · Mar 16, 2026

In my opinion, you compare gold with gold. And that's what I say as a pup fan

mildrider · Mar 16, 2026

I've been a mostly loyal fan of Pennzoil products for about 50 years now. I've owned good vehicles and real junkers. But I have never had any issues with engine problems because of oil.

olyelr · Mar 16, 2026

Ive been running amsoil 0w40 signature series in my 6.4 since new. Have 10 years/130k miles on it and no motor issues yet or any lifter ticks. I change the oil and filter around 6-8k miles. I think if i had to do it all over again, i would just get the cheapest whatever brand compatible oil and change it every 3-5k.

Lard · Mar 16, 2026

Niether

DILLIGAF · Mar 16, 2026

OFw Kalli said:
In my opinion, you compare gold with gold. And that's what I say as a pup fan

there isnt a single posted UOA that shows these oils are Gold, Bronze maybe at best....lol...

2019_RPX_LTD · Mar 16, 2026

Been doing dealer oil changes since new based on the oil minder OCI (10K miles). They use PUP 5W20. Now at 150K miles and truck is down less than 1/2 quart at OCI. No issues.

lAWROSA · Mar 16, 2026

I use 10-30w PUP in mine. Change when the meter runs low. about 7500 miles. I only have 50k miles as the truck sits mostly. I have extended warranty. When that warranty ends in 2027 im going right to the walmart supertech oil 10-30w.

Oil is oil and I don't pay for expensive stuff. waste of $. I put super tech 20-50w in all my bikes last 30 years or so. Never any oil related issue. well over 100 k mils on those. All my cars and trucks always got super tech oil.

This truck I bought with very low miles so I kept the oil the dealer had in it PUP. If ya want to spend $ on expensive amsoil stuff go a head. Its usually a feel good thing and mind over matter. Like spend $120 bucks on oil the truck runs better then on Walmart oil type mind garbage.

Lets be real here. when was the last time someone had an oil related engine issue where the oil caused it and not just a mechanical issue from say the build process?

Its all psychological mind games

anyway Wics oil filtes and PUP. Oil pressure always in 50ish area 60ish on start

OCVstar · Mar 17, 2026

If you’re like me once you get to 5000 miles your going to replace it anyway. If that’s the case it doesn’t matter.

Burla · Mar 17, 2026

olyelr said:
Ive been running amsoil 0w40 signature series in my 6.4 since new. Have 10 years/130k miles on it and no motor issues yet or any lifter ticks. I change the oil and filter around 6-8k miles. I think if i had to do it all over again, i would just get the cheapest whatever brand compatible oil and change it every 3-5k.

Nah, you were right the first time. Detergency is elevated in synthetic plus clean base oils. This is a great video because they had no horse in the race as Valvoline tested THEIR conventional oil against their synthetic and did a tear down. Amazing a company would show you part of their own line up is junk. Yes they got a lot of miles on these engines to your point, but it is hard to compare this to actual miles on the road over a decade. The true challenge is filtration to last as long as synthetic. I will say there are many synthetics such as Kirkland or supertech or halvoline in a box that are nearly as cheap as the cheapest conventionals, so yes short interval always beneficial. The new specs sp and SQ have really uniform formulas, there is less difference in oils.

Valvoline Full Synthetic vs. Conventional | 500K Miles Engine Teardown

Our engine lab recently conducted a test comparing #Valvoline Full Synthetic vs. Conventional oils. Can you guess which engine used Valvoline Full Synthetic?...

youtu.be

.

Burla · Mar 17, 2026

Important, note around 2 minute mark, they both had cats fail, pay attention to the mileage difference in this fails.

olyelr · Mar 17, 2026

Burla said:
Nah, you were right the first time. Detergency is elevated in synthetic plus clean base oils. This is a great video because they had no horse in the race as Valvoline tested THEIR conventional oil against their synthetic and did a tear down. Amazing a company would show you part of their own line up is junk. Yes they got a lot of miles on these engines to your point, but it is hard to compare this to actual miles on the road over a decade. The true challenge is filtration to last as long as synthetic. I will say there are many synthetics such as Kirkland or supertech or halvoline in a box that are nearly as cheap as the cheapest conventionals, so yes short interval always beneficial. The new specs sp and SQ have really uniform formulas, there is less difference in oils.

Valvoline Full Synthetic vs. Conventional | 500K Miles Engine Teardown

Our engine lab recently conducted a test comparing #Valvoline Full Synthetic vs. Conventional oils. Can you guess which engine used Valvoline Full Synthetic?...

youtu.be

.

yes i watched that video a while back. Yea i thought it was a great video!

06 Dodge · Mar 17, 2026

I have seen PUP hold well in some engines for up to 12 months / 10k and poorly in others in 12 / 5k so unless your doing oil testing a person does not know for sure just how good the oil they use is doing, the only way to know if you need Amsoil's best or if you can do okay with PUP or PUP plus an oil additive is by oil testing...

Amsoil Signature or Pennzoil Ultra Platinum

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