Anyone ACTUALLY running 5w-30 or even 10w-30? Thoughts? Experience? Any REAL TRUTH to throwing a code running higher weight oil (no conjecture please)

[HEMIJAKE]

As long as you run good quality oil and change it regularly, there probably isn't any measurable difference.

That's what I've always thought too.

 

[silver billet]

The engine sounds like nothing out of the ordinary and you call that a problem and that the factory weight oil is incorrect. You sound delusional. Then you think that based on your experience hauling your groceries home every Friday, that me, already towing the same 7k# trailer over 125k miles with Hemi engines don’t know what I’m doing by following the Factory Service specs.

Like I wrote earlier, your advice is poor with nothing to back it up but your opinion of what you think you hear. You should try spending more time behind the wheel listening to the sound system instead of under the hood listening to the engine imho.

You sound upset

I tow a trailer all the time in the spring/summer/fall months. My hemi sounded normal. When you drove it it sounded just like every other hemi that I test drove, and also my brother's who happens to own a hemi, and a few friends who also own hemis. I'm very familiar with the "normal" hemi sound. When you replace that factory oil with RL, it quiets down. This is a fact, and it's not just something I noticed. Many users have reported this, and some have even video'd the evidence which is clearly noticeable.

I have hit 250 degrees while towing up a small hill in the summer. There are also way too many reports of temps getting past that on much large mountain climbs: 255, 260. If you're still using 0w-20 at those temps, well then you are nuts. No other way to put it. The hemis do not have a large enough oil cooler.

0w-20 is a fuel efficiency oil. 5w-30 is the oil you need when working it. And RL just happens to be the oil which kills the hemi tick and quiets the general valve train noise. Apparently facts are offensive these days, who knew.

 

[IvoryHemi]

I don’t understand why Ram would publish the 30-weight requirement for 14k+ lbs GCW if oil weight didn’t matter

NOTE: For 2500/3500 trucks with a 5.7L engine operating under a gross combined weight rating of 14,000 lbs (6 350 kg) or greater, SAE 5W-30 engine oil is recommended for all operating temperatures.

 

[Cbty2050]

I don’t understand why Ram would publish the 30-weight requirement for 14k+ lbs GCW if oil weight didn’t matter

NOTE: For 2500/3500 trucks with a 5.7L engine operating under a gross combined weight rating of 14,000 lbs (6 350 kg) or greater, SAE 5W-30 engine oil is recommended for all operating temperatures.

They haven't used a 5.7L in the 2500/3500 truck in how many years?

 

[SD Rebel]

As long as you run good quality oil and change it regularly, there probably isn't any measurable difference.

Exactly my thought!

 

[IvoryHemi]

They haven't used a 5.7L in the 2500/3500 truck in how many years?

2018 was the last year... current version of the 5.7L has been around since 2009

 

[Cbty2050]

2018 was the last year... current version of the 5.7L has been around since 2009

2017 3500 5.7L is the same as a 2022 1500 5.7L?

 

[silver billet]

2017 3500 5.7L is the same as a 2022 1500 5.7L?

The 2500 5.7 does not have MDS.

In the user manual for the 1500 5.7 they said (paraphrasing) 30 weight oil may prevent MDS from working. Nobody running RL 5w-30 or 0w-30 has ever reported problems with MDS not working, it's a non issue in reality.

 

[IvoryHemi]

2017 3500 5.7L is the same as a 2022 1500 5.7L?

Yes, only difference is the tune and MDS

 

[ekaz]

My dealership put 10-30 in my truck without advising me. I read the invoice and had them re do the oil change. Two oil changes later they did the same thing!!!!! Now my name in their computer is MR 10w 20!!! Use what the owners manual and oil cap say. And eat your peas and carrots. And if you Google the Twitter to much you will go blind in the one eye!

Didn't you just start another entire thread where you are listed at MR 5w20 cause they put in 5w30?

 

[MontFla]

Didn't you just start another entire thread where you are listed at MR 5w20 cause they put in 5w30?

Still getting used to the site? I thought that was a reply to something

 

[Cbty2050]

Yes, only difference is the tune and MDS

Similar but not the same.

 

[Cbty2050]

The 2500 5.7 does not have MDS.

In the user manual for the 1500 5.7 they said (paraphrasing) 30 weight oil may prevent MDS from working. Nobody running RL 5w-30 or 0w-30 has ever reported problems with MDS not working, it's a non issue in reality.

P1521 is a code that can set. It's odd I know.

 

[Idahoktm]

The 2500 5.7 does not have MDS.

In the user manual for the 1500 5.7 they said (paraphrasing) 30 weight oil may prevent MDS from working.

There is no such language in the manual. As a matter of fact, I can't find any reference to MDS in the owner's manual.

 

[silver billet]

P1521 is a code that can set. It's odd I know.

The code is definitely real, and if you go out of bounds too far with the viscosity it will appear. But I haven't read any reports of RL 0/5w-30 setting the code off in either a 4th gen or a 5th gen.

 

[IvoryHemi]

There is no such language in the manual. As a matter of fact, I can't find any reference to MDS in the owner's manual.

Some vehicles with the 5.7L have the warning in the owners manual, some don’t. There is no consistency.

 

[silver billet]

Some vehicles with the 5.7L have the warning in the owners manual, some don’t. There is no consistency.


View attachment 118230

Thanks for that, I was just about to hunt it down. What it says in the manual depends on the year of the truck.

 

[Idahoktm]

Some vehicles with the 5.7L have the warning in the owners manual, some don’t. There is no consistency.


View attachment 118230

This is the only reference to MDS in the 2021 manual.

 

[silver billet]

This is the only reference to MDS in the 2021 manual.

View attachment 118263

It's in the 2013 user manual and may be in other years as well:

https://pictures.dealer.com/tomahlchryslerdodgecllc/ba6ca88e0a0d02b70137ef349ec053be.pdf

 

[silver billet]

Note how they recommend 5w-30 in the 2500: