Higher Lead then Iron? Thicker Oil?

[Ryan00TJ]

These are the last two analysis' on my mother's Monte Carlo. I've read on here before that when your lead number is higher than your iron that is a sign your engine might need a thicker oil to protect the bearings? Her 3.8L now has 92000 miles and runs perfectly but I was thinking on going with Schaeffer's 15W-40 PAO Blend on the next interval to see if the lead number drops.

1998 Chevrolet Monte Carlo Z34 3.8L
Schaeffer 10W-30 PAO Blend
4,130 miles on oil
87,127 Miles on Engine
Oversize Wix oil Filter 51036
K@N Panel Air Filter

Car is driven everyday around 50 interstate miles.

1st number is new analysis 2nd number is previous sample same interval only with M1 10W-30

code:
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Aluminum 4 4
Chromium 0 1
Iron 7 15
Copper 18 17
lead 12 6
Tin 0 2
Molybdenum 88 63
Nickel 0 0
Manganese 0 0
Silver 0 0
Titanium 0 0
Potassium 9 34
Boron 8 120
Silicon 9 9
Sodium 11 9
Calcium 2147 2822
Magnesium 7 41
Phosphorus 809 814
Zinc 973 1036
Barium 1 1
SUS Viscosity= 60.5 59.2
Flashpoint in deg.F=415 425
Fule-0.5 .5
Antifreeze=0.0 0
Water=0.0 0
Insolubles%0.5 0.4
TBN= 2.6 5 -Old Method

I did do an AutoRx flush before the run with Schaeffer's oil above. Could the AutoRX cleaning cause the higher insolubles and lead count? Any opinions on what to do?

 

[uconn1150]

Was Mobil 1 in the engine all along? If so, uh oh!

 

[widman]

there are many more variables. Cleaning with AutoRX could also change the numbers. Neither is bad. If you put them alongside the 62 I got back this morning you are definitely in the best 10% with either sample. Your copper is of more concern than the iron.

 

[Ryan00TJ]

Uconn1150...Up until I got ahold of it at 70,000 miles it had Pennz 10W-30 and Purolator filter courtesy of the local quickie lube. I then ran two intervals of M1 Supersyn 10W-30 then the AutoRx flush then went to Schaeffer's which is what i'm currently running. I also noticed the high copper but it seems these 3.8's always show high teen copper numbers.

 

[jason07-1zzfe]

quote:

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Originally posted by Ryan00TJ:
... Could the AutoRX cleaning cause the higher insolubles and lead count? ...

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Highly probable since you are on the "rinse" cycle. Doubt you need thicker.