I guess that's the point. The factory is now recommending/installing iridium. So are you wrong for installing them in a older hemi as long as it is of the same generation engine? It's like oil change intervals, when the '09 came out it was a max of 6k, then my 2011 states 8k, and now I hear it's up to 10K. What changed in the engine to allow that?

 

Yep, Hemi 5.7 & 6.4 are now 10k oil change intervals. My 6.7 Cummins is 15k - BUT there's a catch at least with the diesel - it's 15k OR 6 months - whichever comes first and I understand FCA is big on this for warranty. I haven't checked the fine print on the gassers.

Thing that kinda sucks for me is I'm a 10k a year driver, so I'm looking at 5k changes at 12 quarts. I've heard deleted guys with no EGR are running synthetic 24,000 miles and Blackstone analysis is coming back it's in almost new condition.

and now I've completely hijacked this thread. LOL...

 

A fair question.


As long as the heat range and gap setting of the iridium plug meets the factory specification, the change in electrode material will make no difference.


Prior to Chrysler supplying an iridium plug in the new Hemis, I never found one that the cross-referenced plug heat range matched up. I suspect that if you used the new iridium in an older Hemi it would likely work, although I believe they changed the heat range at least once prior to 2009. Changes to air-fuel ratio, combustion chamber shape, and cam timing could require a heat range change, and previous years they specified a different copper plug.


Regards,
Dusty


2014 Ram Big Horn 1500 Quad Cab 2WD, 5.7 Hemi, 8HP70, 3.92 LSD, factory dual exhaust, 20” wheels. Now at: 023397 miles.

 

For 2014 the 5.7 Hemi oil change is determined by the Oil Life Monitor. It will message you when the oil and filter should be changed. But the oil should never exceed 10,000 miles regardless.


Regards,
Dusty

2014 Ram Big Horn 1500 Quad Cab 2WD, 5.7 Hemi, 8HP70, 3.92 LSD, factory dual exhaust, 20” wheels. Now at: 023397 miles.

 

I think that the early models came from the factory with dyno oil, thus the earlier intervals. The newer models are synthetic filled. I bet that that's the only difference, that and a new program for determining when to turn the service light on.

 

No, they still come with Dyno oil. The change interval was a max of 6k from 2004-2010, then it jumped to 8k for 2011-2012, and now it's at 10k. I understand that they may have just determined over the life of their gas engine design that they can push it out more and more. It just tells me that with no physical change to design, requirements may change.

 

Since I get all of my oil changes done at the dealer, I did inquire once about the oil they used. They buy it in bulk from a refiner/distributor out of Buffalo, New York (I think the company is American Petroleum Products Corp.). The oil used at the factory is available to dealers in 55 gallon drums, however my dealership prefers to not to handle drums and instead has large bulk tanks that are directly filled by the distributor.


I inquired if the oil they buy in bulk met Chrysler specifications and was told it had to be approved specifically by Chrysler for use in the dealership. The 0w-20 used in trucks is listed by the distributor as a semi-synthetic.


This implies that the factory fill is also likely a semi-synthetic.


Best regards,
Dusty


2014 Ram Big Horn 1500 Quad Cab 2WD, 5.7 Hemi, 8HP70, 3.92 LSD, factory dual exhaust, 20” wheels. Now at: 023947 miles.

 

that makes sense, I can't imagine leaving dyno oil in a truck for 10k miles

 

Yes, I agree. Neither can I. But maybe Chrysler engineering has done due diligence in their analysis and determined that regular dyno oil will provide adequate and reliable lubrication over the 100,000 mile term without any damage. After all, if not the company would be looking at spending money on warranty claims and someone in engineering would be getting the boot!


Bests,
Dusty
2014 Ram Big Horn 1500 Quad Cab 2WD, 5.7 Hemi, 8HP70, 3.92 LSD, factory dual exhaust, 20” wheels. Now at: 023991 miles.

 

The 5.7L come out with 5w-20 standard oil. The FCA MS-6395 oil standard that Ram recommends is ancient. Any standard dyno oil does meet that spec. Now, on the 6.4L side of the house it's a different story. They straight up recommend Pennzoil Ultra 0w-40 and the spec is MS-12633. That is the Mopar synthetic. How's that for strange? Why not synthetic for the 5.7?