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Old 12-12-2008, 02:08 PM   #11 (permalink)
Manic Mechanic
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Mines near 45 at idle and 68 on the road. You need 15 to float the bearings on a running engine. Makes me wonder how accurate the gauges are.

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Old 12-12-2008, 03:49 PM   #12 (permalink)
GetSome8.1HD
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Not accurate at all. I was at OP marks too but got sick of it and switched to 10-30 Mobil 1 about 2 years ago and has been around 26-30 at idle and above 40 cruising.....60+ at start up. Run some 10-30 and it will bring it up.
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Old 12-12-2008, 08:24 PM   #13 (permalink)
07GreyLBZ
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Thanks for all of the great information! I guess I can sleep a little better knowing that it is a character trait of the 8.1. I didn't know if it was similar to the earlier Duramax engines that came with an 80 psi oil pressure gauge. After all of the concern of owners about the cold startup psi pegging the gauge, the General decided to put in the 120 psi gauge. I guess I will run either the 10-30 or the same 15-40 I run in my Duramax. There wouldn't be any harm in running a 15-40 in an engine that spec'd a 5-30 would there?
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Old 12-12-2008, 09:02 PM   #14 (permalink)
GetSome8.1HD
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I personally wouldnt go ever 10-30. Im thinking bout going back to 5-30 in winter as it gets a bit hard to crank in cold....or my battery sucks...lol.
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Old 12-12-2008, 11:59 PM   #15 (permalink)
matt4270
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I get a bit of on-start valve clatter with 5-30, switched to 10-30 Mobil 1, seemed to help! Wouldn't go heavier than that though!!
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Old 12-13-2008, 12:14 AM   #16 (permalink)
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Quote:
Originally Posted by GetSome8.1HD View Post
I personally wouldnt go ever 10-30. Im thinking bout going back to 5-30 in winter as it gets a bit hard to crank in cold....or my battery sucks...lol.

Diehard Platinum. Solved all slow crank issues. Spendy though!
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Old 12-13-2008, 09:35 AM   #17 (permalink)
GetSome8.1HD
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Thinking Optima
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Old 12-13-2008, 12:26 PM   #18 (permalink)
Blk04HD
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I ran 15/40 Rotella in my 02 8100 and never had any trouble, the truck quit burning a quart every 1000 miles too.
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Old 12-13-2008, 06:30 PM   #19 (permalink)
GetSome8.1HD
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That thick oil is a biatch in the winter though. I can watch the pressure jump around at start up then settle.
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Old 12-17-2008, 01:30 PM   #20 (permalink)
Ramv
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Quote:
Originally Posted by GetSome8.1HD View Post
Thinking Optima

I have an Optima in my Dodge. Not impressed. Stock Mopar was much better, however everytime I put the Dodge on its side, it would leak acid and destroy the vacuum lines. The Optima doesn't do that.

It doesn't have near as much winching capability or ability to hold a charge as the stock Mopar (which was only rated at 750 CCA??) I tried to warranty it, but every place I took it said was fine (although a couple said they didn't sell Optima any more since they were lacking in QC)

Anyway rant off, but I would conisder a different direction, especially in a non-off road vehicle.
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