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#236184 - 09/23/04 04:48 AM Schaeffer 15W-40 Blend 6287 Miles 98 Monte Carlo 3.8L Z34
Ryan00TJ Offline


Registered: 07/08/02
Posts: 742
Loc: Lake Anna, VA
OilGaurd Labs
1998 Chevrolet Monte Carlo Z34 3.8L
Schaeffer 15W-40 PAO Blend
6,287 miles on oil
103,434 Miles on Engine 5qt Sump 3/4qt Makeup
Oversize SuperTech oil Filter ST3980
K@N Panel Air Filter
6 months on oil
Car is driven everyday to work 5miles and is brought up to operating temp most of the time.

1st number is new UOA. 2nd number is 4500 miles w Schaeffer 10W-30 Blend 3rd number is previous sample 4700 miles only with M1 10W-30


Aluminum 0 4 4
Chromium 0 0 1
Iron 15 7 15
Copper 21 18 17
lead 8 12 6
Tin - 0 2
Molybdenum 65 88 63
Nickel - 0 0
Manganese - 0 0
Silver - 0 0
Titanium - 0 0
Potassium 34 9 34
Boron - 8 12
Silicon 7 9 9
Sodium 49 11 9
Calcium - 2147 2822
Magnesium - 7 41
Phosphorus - 809 814
Zinc - 973 1036
Barium - 1 1
SUS Viscosity= 14.5cst 60.5 59.2
Flashpoint in deg.F= - 415 425
Fule- .0 0.5 .5
Antifreeze= 0 0 0
Water= 0 0 0
Insolubles% - 0.5 .4
TBN= 7.5 2.6 5
Nit% 0
Oxi% 12.3

The wear numbers are not bad at all for this interval but the climbing potassium @ sodium are starting to alarm me. I've been keeping track of the coolant in the overflow and it has not dropped so the leak must be small. If the numbers rise by next UOA I will take action and have the leak fixed. Please post your opinions on this?

[ September 23, 2004, 07:56 PM: Message edited by: Ryan00TJ ]

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#236185 - 09/23/04 05:36 AM Re: Schaeffer 15W-40 Blend 6287 Miles 98 Monte Carlo 3.8L Z34
Al Offline


Registered: 06/08/02
Posts: 13581
Loc: Elizabethtown, Pa
You have a small coolant leak. Its probably intermitant. Don't know what to tellyou. My son has the same problem with his 3.4 Pontiac. It is about the same level. We are doing more frequent oil changes. You might want to do the same. You might want to try Barsleak since it is small.

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#236186 - 09/23/04 08:56 AM Re: Schaeffer 15W-40 Blend 6287 Miles 98 Monte Carlo 3.8L Z34
SSDude Offline


Registered: 12/14/03
Posts: 1488
Loc: Los Angeles
Fix the leak and get some GC. Your numbers were not bad but they would be lower with GC.

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#236187 - 09/23/04 11:06 AM Re: Schaeffer 15W-40 Blend 6287 Miles 98 Monte Carlo 3.8L Z34
Dominic Offline


Registered: 07/04/02
Posts: 1774
Loc: Alabama
I would compare yours with mine, but mine has lower wear numbers and I use blackstone labs. Feel free to look at my maxlife analysis thhough! I have a 3.8L Camaro [Smile]

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