What's the correct oil and temp. settings for the 5.7 Hemi?? - Chrysler 300C Forum: 300C & SRT8 Forums
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post #1 of 10 (permalink) Old 11-22-2009, 08:11 AM Thread Starter
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What's the correct oil and temp. settings for the 5.7 Hemi??

I have a 300C AWD with a 5.7 Hemi.

Just had my oil changed and thought I would check my oil pressure digital read out. I notice the oil pressure when fully warmed up and sitting at an idle reads between 16 to 20lbs. Is that normal presure for the car at idle?

When at highway speed the oil pressure goes up to 45 to 50lbs.

Also the temp. gauge reads 210 degrees at normal highway speeds...seems high, but the idiot gauge on cluster just is always in the same position at the half way mark.

Look forward to any advice.

Gary
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post #2 of 10 (permalink) Old 11-22-2009, 10:47 AM
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Your stock Tstat doesn't open fully until 203 F, so the coolant temperature looks completely normal. Oil temps will be above that by quite a bit, but I haven't paid attention to idle and rolling oil pressure. But I'm sure someone has...

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post #3 of 10 (permalink) Old 11-22-2009, 11:23 AM
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210 is normal with stock thermostat. I get 52 psi oil pressure at 70 mph. Not sure about oil pressure at idle as I haven't specifically looked at it, but 16-20 psi sounds normal as well.
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post #4 of 10 (permalink) Old 11-22-2009, 11:55 AM
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both are normal
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post #5 of 10 (permalink) Old 11-22-2009, 12:20 PM Thread Starter
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Good to know my temp is running normal at 210 degree.....look forward to anyone's advice on the idle oil pressure issue?

Gary
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post #6 of 10 (permalink) Old 11-22-2009, 02:15 PM
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Quote:
Originally Posted by Gary25 View Post
Good to know my temp is running normal at 210 degree.....look forward to anyone's advice on the idle oil pressure issue?

Gary
You don't have an oil pressure "issue" - - your oil pressure is completely normal too; you only need 6 or 7 psi at idle to keep everything lubricated. As the engine RPM increases, so does the oil pump RPM - so you get more pressure when the engine is running faster, which is when you need it.

Last edited by kevenj; 11-22-2009 at 02:16 PM.
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post #7 of 10 (permalink) Old 11-23-2009, 01:47 AM
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I've always had my engine idle around 21psi, engine temp lately is high 190s/low 200s (but it's a lot colder!)
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post #8 of 10 (permalink) Old 11-23-2009, 04:25 AM
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210 degrees at highway speeds is too high. I would see 197 to 203 at highway speeds with my stock tstat.
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post #9 of 10 (permalink) Old 11-23-2009, 12:38 PM
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That's what I figured unless it's rather hot outside, in 115 degree weather it does 210-220 (I can't remember) LOL.

Last edited by OoTLink; 11-23-2009 at 12:38 PM.
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post #10 of 10 (permalink) Old 11-23-2009, 12:53 PM
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nominal

all reported numbers are nominal.

200-225 is a normal coolant range. 10-60 is a normal oil pressure range.

All vehicles are subtly different, as well as operated differently under differing conditions. So the numbers var significantly.

Yours are a-ok

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