Hey guys I ordered a 21 redeye hellcat challenger widebody. I’m going to get the oil changed at 500 miles for the break-in can you guys explain what that does from my understanding it just gets rid of the shavings. And is it true you have to keep it under 3000 RPMs for the first 500 miles would it be a big deal if you didn’t?
New engines shed metal trash, debris.
There is a filter which captures any metal debris the new engine sheds, and it does shed metal debris, lots of it. Some is just "trash" that inevitability gets left in the engine -- machining swarf -- but every surface will add its quota of metal debris -- mostly in the form of fine metal particles.
So the oil filter captures the metal particles, but this doesn't mean it always "retains" the metal debris in its filter element. As a result the filter housing oil is loaded with metal particles.
The concern is if at cold start or at any other time oil pressure spikes too high this can have the filter oil bypass valve open and route unfiltered oil to the engine. If one could see what has been "trapped" in the filter housing he wouldn't sleep nights.
Here is a pic of the oil the filter of my 2008 Porsche Cayman S contained. I drained this into a clean oil drain pan:
The light coloring is from all the (mostly) aluminum the engine shed in 750 miles.
The other problem is the new engine generates a lot of blowby and this contaminates the oil. The oil is compromised in its ability to properly lubricate the engine.
Before I owned the Cayman, with a car for which the factory called for first oil change at 15K miles, on a whim I had the oil analyzed with 4K miles on the new engine. The oil contained 7% water. With over 9 quarts of oil capacity the oil had around 1/2 quart of water in it. Water in oil lowers the oil's viscosity and well, that's not what one wants. The water in the oil arose because the engine just didn't get that hot -- the 4K miles was put on the car from Jan 2002 to sometime in March 2002 -- and the oil didn't get hot enough to boil the water into vapor and for the vapor to then be removed via the PCV system.
There are reports these engines are run on a dyno for 42 minutes. I have seen nothing official from the factory on this. I came upon this in a magazine article.
Frankly I have my doubts all Hellcat (and I was told the Scat Pack engine receives the same dyno time) gets 42 minutes of dyno time. I watched several Dodge engine factory engine build videos and in one it does show a guy rolling a new engine -- not a Hellcat engine -- from the assembly line to a large dyno room. The engine is hooked up to the dyno and he sits at a console.
To spend 42 minutes on a dyno would require, being conservative, a couple of minutes of time to connect the engine to the dyno and then disconnect it after. Thus call it 45 minutes. The Dodge engine factory can build hundreds of engines per hour. To then spend 45 minutes to run each engine on a dyno -- to get one engine a minute out of the dyno "ward" would require at least 45 dyno stations and 45 dyno room employees -- which just adds considerably to the cost to build the engine.
While I believe early Hellcat/Scat Pack engines were all dyno'd -- prior to putting the engines into cars which were almost certainly destined for use by factory big wigs, automobile mag car reviewers -- I would need to see something official from Dodge that
all (Hellcat/Scat Pack) engines are dyno'd even to this day. So far I have not found this.
Regardless does 42 minutes on a dyno fully break in the engine? No way. 42 minutes of engine run time represents say 42 minutes at 30mph -- the "average" speed of a passenger car over time -- which works out to around 22 miles. That is hardly enough "miles" to break in an engine.
As the pic shows above after 750 miles the amount of "trash" the engine shed. What I don't have is a pic I took of the filter housing oil when I changed the oil a 2nd time at around 1500 miles. It had some "color" to it but it was so slight it did not show up in a picture.
Yes, a number of new car owners do not bother with an early oil change and the vast majority do not experience any engine issues. But I like to improve my odds. The Hellcat engine is a high performance engine. To help ensure its long and trouble free service I have no problem with an early oil change or two.
To that end for my new 2018 Hellcat I had the oil changed at 500 miles, 2K miles then at 5K miles. Then I settled into a 5K miles/6 month oil change schedule.
But i this regard the Hellcat was not that "special". Since my first new car way back when I have always changed or had changed the oil early.
It is your car. You can of course do what you want. But my advice is unless forbidden by the factory (owners manual) have the oil changed -- either do it yourself or have it done at the dealer -- early. Maybe you don't want to follow my "example" of 500, 2K, 5K mile oil changes.
But I'd rather do an early oil change than one day start the engine and hear the "tick".