Amsoil SS 5w20 or 5w30??

[Greg0517]

Recently hit 95,000 miles on my 21 classic 5.7
Was thinking of switching to Amsoil SS moving forward, would anyone recommend using 5w20 or 5w30?
i have been running 5w30 synthetic oils since day 1 but wasnt sure if Amsoil SS 5w20 would suffice in this case moving forward.
Can i go past 10k miles on SS? never gone that far before on any other oil.
thanks

 

[rzr6-4]

I ran 5w20 for a long time and recently switched to 5w30 as I slowly lose oil during the use cycle, so the thicker fluid should help protect against that. Many here will suggest that you should use 5w30 from the beginning and never go to 5w20. Open for debate I suppose.

Can i go past 10k miles on SS?

I always buy 10k mile oil and filter and even then I change every 5k. I know 10k should be fine but I certainly wouldn't try to push past that. Hemis are known for lifter issues, going past your oil life is just asking for trouble.

 

[HEMIMANN]

There is no debate at this point in the ancient Hemi Gen III life (20 years+ old).
5W-30 for both wear reduction and lifter lubrication.
5W-20 was nothing but an EPA minuscule fuel economy increase at the expense of higher wear rate.
For those that think it's critical for MDS operation, ask yourself why 0W-40 is recommended for 6.4L Hemi with identical MDS system as 5.7L Hemi on 5W-20?
Think!

 

[Wild one]

Recently hit 95,000 miles on my 21 classic 5.7
Was thinking of switching to Amsoil SS moving forward, would anyone recommend using 5w20 or 5w30?
i have been running 5w30 synthetic oils since day 1 but wasnt sure if Amsoil SS 5w20 would suffice in this case moving forward.
Can i go past 10k miles on SS? never gone that far before on any other oil.
thanks

If you go digging,you'll see how tiny the oil passages are to the top end of a Hemi,and the last thing you want is to stretch your oil change intervals to 10,000 miles,and have sludge build up in those holes.If cost is a factor run a cheaper 5W-30 with a bottle of Lube Gard engine protectent,and change your oil at 5,000 miles.
Pennzoil Ultra Platinium 5W-30 with a bottle of Lube Gard has the rep of being a poor mans Redline

 

[Burla]

amsoil ss 5w30 = visc 10.3
amsoil ss 5w20 = visc 8.8
-----
difference in visc 1.5

So we are having a discussion of two oils with a difference of 1.5 viscosity in use and by the time it hits a uoa is likely tied or close. So the correct answer is whatever makes you feel better because your truck wont know the difference. Their 5w20 is stout and stable for a 20 weight, their 5w30 is light for fuel goals. Compare that to redline visc 12, now that is a 5w30.

Amsoil has put their users in a bind, because next step is 0w40 visc over 14, so they just don't have a top option if someone wants a stout 5w30 as far as viscosity goes.

 

[HEMIMANN]

I doubt SS 5W-30 shears down much @ 5k OCI. 1.5 cSt @ 100 C is +17% thicker oil, not insignifiant.

I wouldn't dismiss an "energy saving SP" 5W-30. I'd sure use that before I'd use a 5W-20. IDC since we use Red Line 5W-30, I just wouldn't conclude 5W-30 isn't helpful otherwise.

 

[OC455]

5W30.....

 

[Greg0517]

Good info as usual guys, thank you all

 

[Burla]

I doubt SS 5W-30 shears down much @ 5k OCI. 1.5 cSt @ 100 C is +17% thicker oil, not insignifiant.

I wouldn't dismiss an "energy saving SP" 5W-30. I'd sure use that before I'd use a 5W-20. IDC since we use Red Line 5W-30, I just wouldn't conclude 5W-30 isn't helpful otherwise.

It's a mixed bag, depends on the engine, di's are shreding it and diluting it and average engines you are correct. However, with hemi's you know they can shred some oil depending on how the engine is.

Pretty interesting, now that Europe has gone away from woke with oil you have seen many market corrections, and funny amsoil is no different, their Euro formulas are more stout then their USA formulas, lol. Makes you laugh? Check out pdf on AEL 5w30 visc 11.6 and EOT 0w30 visc 12.3 (yes 0w30 12.3!!) euro formula amsoil.

America is so stupid anymore it makes my teeth hurt.

I will say some of those euro's omit moly, I would enhance it with biotech until I verified moly level is good.

 

[Burla]

On paper, that Amsoil 0w30 looks incredible, Carry's all of the German's desirable specs, 3 Mercedes, Porsche, BMW, etc.

It has to be Amsoil EOT 0w30, gonna have great cold flow plus great warm viscosity.

 

[Mike Townsend]

I've always used Amsoil SS 5w20 in my 2014 but did just order some 5w30 just to see if it makes a difference. I currently do not have the ticking some have when you start the truck after sitting.

 

[BenchTest]

If you go digging,you'll see how tiny the oil passages are to the top end of a Hemi,and the last thing you want is to stretch your oil change intervals to 10,000 miles,and have sludge build up in those holes.If cost is a factor run a cheaper 5W-30 with a bottle of Lube Gard engine protectent,and change your oil at 5,000 miles.
Pennzoil Ultra Platinium 5W-30 with a bottle of Lube Gard has the rep of being a poor mans Redline

Valvoline Restore and Protect seems to be making waves in this realm. I've watched several Youtube videos put out by the Oil Nerd Community (unofficial name) where they science the crap out of their experiments. Seems this oil does a GREAT job of cleaning out buildup and performs well as a premium engine oil. I'm thinking this would be a good option to consider, especially on 50K+ mile engines that have Variable Valve Timing and other like components. One of the experiments involved a persistent lifter noise that cleared up after a few hundred miles of the oil circulating. Another was a tear down comparison of what's being transmitted to the filter (being washed from the internals) by usage of the detergents. Interesting stuff. My only concern would be putting this in a higher mileage vehicle that has degraded oil seals. Get that good detergent moving around, removing deposits all over, and expose a weak oil seal, and then have a leaking engine

Add - there's never a reason to go 10k on an oil change. I don't care if it's Ultra Super Mega Platinum Fresh Squeezed Synthetic Dinosaur Oil, still won't run a 10K interval. TOO many things depend on the oil being "within spec" to let it run that long.

 

[DILLIGAF]

RL 5W30

 

[Greg0517]

@BenchTest i agree, especially the 10k change interval, seems a bit on the high side even with super premium oils.

 

[HEMIMANN]

It's a mixed bag, depends on the engine, di's are shreding it and diluting it and average engines you are correct. However, with hemi's you know they can shred some oil depending on how the engine is.

Pretty interesting, now that Europe has gone away from woke with oil you have seen many market corrections, and funny amsoil is no different, their Euro formulas are more stout then their USA formulas, lol. Makes you laugh? Check out pdf on AEL 5w30 visc 11.6 and EOT 0w30 visc 12.3 (yes 0w30 12.3!!) euro formula amsoil.

America is so stupid anymore it makes my teeth hurt.

I will say some of those euro's omit moly, I would enhance it with biotech until I verified moly level is good.

Why would di shred a 5W-30?
Di soots and fuels any oil.

 

[Burla]

Why would di shred a 5W-30?
Di soots and fuels any oil.

This one first one Google sent me, visc now 8.5 with no appreciable fuel dilition. You tell me why, higher revving? 2200 miles, and yes track and street, but it's a fiesta, lol. Wear suggests not driving very hard at all. No insolubles even hinting at soot.

 

[Burla]

BTW, that additive packages looks killer, only downside is viscosity.

 

[HEMIMANN]

This one first one Google sent me, visc now 8.5 with no appreciable fuel dilition. You tell me why, higher revving? 2200 miles, and yes track and street, but it's a fiesta, lol. Wear suggests not driving very hard at all. No insolubles even hinting at soot.

Turbo shearing it? Some of them little guys spin up near 100,000 rpm. Not a typo, either.

 

[Greg0517]

Has anyone tried Kirkland 5w30 full syn? just curious.

 

[Burla]

Has anyone tried Kirkland 5w30 full syn? just curious.

It is what I use in our rav 4, love the stuff, stupid cheap and stout additive package. pqia study shows how good this is.