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Old 02-28-2017, 06:23 PM
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Oil pressure readings ?

So I changed the oil and filter in my new 2016 Red Rock a couple of weeks ago and changed the dash display to the oil pressure reading to check it.

With new oil and a cold engine the readings then and now are in the 85 to 90 psi range, thought that was a little high ....but ok whatever.

I never really checked the oil pressure when it was cold before I did the oil change but I would imagine it would of been the same readings then too.

But as the engine warms up the pressure will be in the 90-80-70 range and then all of a sudden drop down to 40 psi range, then it might jump up to 70 psi again and then down to 40 range with no readings in between.

After the engine warms up it consistently reads in the 30 to 40 psi range depending on rpm as it should.

I know oil pressure is linear with engine rpm so it shouldn't be doing this and it's probably a sending unit malfunction, have there been other reports of the same problem on 16's or is mine a unicorn ?

Thanks

HR

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Old 02-28-2017, 06:54 PM   #2
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My Grand-sons 2016 HR does the same thing.

The 3.6 engine has a two stage oil pump in it. When the engine is cold to warming up, the two stages intermix somewhat. Once the engine oil is a operating temperature, then it will stay in the low output stage. But once that you reach about 3500 RPM, stage two the high output kicks in to activate the piston cooling nozzles.

So what you are describing is normal..

http://www.pentastars.com/engines/tech.php

^^^Read under oil systems.
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Old 02-28-2017, 07:15 PM   #3
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I noticed the same thing in my 2015 and called the dealer about it. He confirmed those readings are completely normal for the 3.6.
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Old 02-28-2017, 07:15 PM   #4
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Perfectly normal, my 2016 Hard Rock does exactly the same thing.
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Old 02-28-2017, 08:12 PM
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Quote:
Originally Posted by Old Dogger View Post
My Grand-sons 2016 HR does the same thing.

The 3.6 engine has a two stage oil pump in it. When the engine is cold to warming up, the two stages intermix somewhat. Once the engine oil is a operating temperature, then it will stay in the low output stage. But once that you reach about 3500 RPM, stage two the high output kicks in to activate the piston cooling nozzles.

So what you are describing is normal..

Pentastar Engines: Overview and Technical Details

^^^Read under oil systems.


I guess you learn something new everyday.....

Never heard of a two stage pump with variable output, I guess that explains that one

Thanks for your and others response's


Now how about that 360 degree loop in the drivers side exhaust pipe ???

What's that all about ?


And whats up with the tach and speedo being reversed, never had a speedo on the left and tach on the right in any vehicle I have owned, (mostly GM) every time I look down to see how fast I'm going I'm only doing 20 or 25 mph then I realize that I'm looking at the tach.

Even my 2005 Wrangler LJ has the tach on the left and speedo on the right.

What was there reasoning for changing something that wasn't broken ?

Thanks again for the help

HR
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Old 02-28-2017, 11:49 PM   #6
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Quote:
Originally Posted by Hard Rocker View Post
I guess you learn something new everyday.....

Never heard of a two stage pump with variable output, I guess that explains that one

Thanks for your and others response's


Now how about that 360 degree loop in the drivers side exhaust pipe ???

What's that all about ?
Provide equal length pipes to the collector. Equalizes back pressure between banks.


Quote:
And whats up with the tach and speedo being reversed, never had a speedo on the left and tach on the right in any vehicle I have owned, (mostly GM) every time I look down to see how fast I'm going I'm only doing 20 or 25 mph then I realize that I'm looking at the tach.

Even my 2005 Wrangler LJ has the tach on the left and speedo on the right.

What was there reasoning for changing something that wasn't broken ?

Thanks again for the help

HR
I agree but have no idea why they did it.
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Old 03-01-2017, 08:18 AM   #7
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My GT500 cluster has the tach on the right hand side, which I like since I have my wide band and other gauges on top of the center console and it's quicker looking back and forth between them.

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