Mobil-1 SuperSyn 10w30 in '00 GM 4.3L V6

[jason07-1zzfe]

2000 GMC Jimmy 2wd
Schaeffer's Lab
Sample date: 8/25/02
Mi. on unit: 60,290
Mi. on oil: 7,511
makeup oil added: 1qt.

copper 4
iron 10
chromium 0
aluminum 3
lead 7
silicon 15
molybdenum 68
phosphorous 878
zinc 861
magnesium 22
calcium 2305

antifreze 0%
fuel negative
water 0%
visc(cSt) 10.94
sulfur 6%
oxidation 0%
nitration 17%

I think the additive depletion may be due to this being the first time this motor has ran Mobil-1(or any syn), so it probably was doing quite a bit of clean-up. Not sure why it thickened. I guess that is part of it. So I don't think I want to run any longer just yet.
Moly plated up a bit

(this is assuming Bob used Schaeffer's lab for the VOA. Bob?)
Oxidation and nitration look good, but I was surprised to see 0 oxidation. But nitration is low too and the way the definition sounds nitration can be a precursor to oxidation, so I guess that is right.

We'll see how the next one looks. Should be even better. But I did put a AC PF52 filter instead of the Mobil1 filter that was on the above sample.

The only thing I didn't like was the consumption. I added 1qt, but consumption was about 1.5. I just didn't add any near the end.

Oh, also don't like the silicon number either. It's the AC Delco high capacity filter...So maybe for "high capacity", they had to decrease the efficiency. Generally that is the way it has to work, unless you increase media area. I should have realized that before I bought it.

I guess I just saw the foam prefilter and thought it might better. I'll get the standard AC OEM filter next time. Or I may just leave this one in forever so it can build up some efficiency.

 

[Patman]

What additive depletion? Those numbers for zinc, phosphorus and calcium look pretty much like all the recent Mobil 1 analysis results. I don't think it starts out with much more than those numbers.

Everything on this report looks great to me! I wouldn't worry about that silicon number, for over 7k it's not bad at all IMHO. This oil looks like it could've easily gone a lot longer, maybe even beyond 15k. How long will you run the second batch for?

 

[Spector]

IMHO your wear numbers look excellent. I would not get overly concerned about 15 ppm of silicon. This could be normal for this engine. If silicon were an issue you would see much higher wear numbers.

I concur with previous psot.

[ September 06, 2002, 10:53 AM: Message edited by: Spector ]

 

[jason07-1zzfe]

Bob's VOA showed 3343 Calcium, 1020 P, 1009 Zn

http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=11;t=000001

edit: ...and so did VaderSS' used analysis

[ September 06, 2002, 11:10 AM: Message edited by: Jason Troxell ]

 

[VaderSS]

Looks good, I'd not worry about the additive numbers. Mobil may still be playing with them.

Silicon has not hit 21(20 over baseline) yet.

The oil has not thickened a full grade yet, so I'd not worry about that either.

With those numbers, I'd go another 3k.

Does this vehicle have an oil cooler?

Did Schaeffer have any comments?

 

[wtd]

Jason,
Your numbers look good to me. I'm going to try the Mobil 1 10W-30 instead of the 5W-30 I've been running in my 98 5.7L to see if it improves my results any.

I'm running an AC-Delco high capacity filter on my truck and my Silicon levels are higher than yours. The only differece I could tell between the high capacity and the regular filter, was that the high capacity was slightly bigger around. Everything else looked the same.

Wayne

 

[jason07-1zzfe]

VaderSS, That's true, they may be. I just thought since it thickened a tad, the additive depletion theory seemed to fit.

No oil cooler. The only thing somewhat related I have done is add Red Line water wetter. It used to run hotter with the a/c on in hot weather. Now it is dead nuts on no matter what. RL WW is supposed get rid of localized hot spots as well. But they don't advertise that aspect

Schaeffer's only said "Contamination and additive depletion levels normal. Maintain current drain interval" ...but do they really want to emphasize the extended drain capability of competive oils?

I do agree that it could go much longer, IF I am wrong about the additive depletion. I may take the current one 3k more. Do you think the AC filter instead of an M1 filter will affect it much?
I think I am right about the depletion though. How many f'in reformulations are they going to do?

Once a week??

 

[VaderSS]

I also run the RL WW. I also run RMI-25 which flushes the system as the car runs keeping evertything clean all the time.

I'm really not sure what effect the AC would have, but I do know that for corvettes, GM specs a standard AC filter(not the UltraGuard) and they have a pretty long drain interval.

I guess they don't push long drains on oils, I don't know if that is for all oils or just competitive oils, but I would take that statement as meaning, "You did not go too far."

Edit;
They specifically told me, "Silicon high, change oil."

[ September 06, 2002, 12:36 PM: Message edited by: VaderSS ]

 

[TooSlick]

Jason,

This is a very clean running engine ...although no TBN is provided it should be pretty high given the low oxidation/nitration levels. In addition the oil has thickened by < 10%, which is a good sign. I don't see any issues with going to a 10,000 change interval, particularly since you are adding some fresh oil from time to time.

BTW, I don't believe the 0% oxidation either - every gas engine sample I've ever seen has had some oxidation, regardless of the number of miles on the sample. Given your nitration levels, I would expect oxidation to be perhaps 8%-10% or so ....

You might want to try oiling the foam pre-filter with some tacky, foam filter oil - this works very well for me.

TooSlick

 

[richard612]

Are you sure that there isn't an oil-to-water intercooler in the radiator tank? My 02 2wd 4.3L S-10 has one...

 

[jason07-1zzfe]

Thanks guys

richard612, actually no, I'm not 100% sure (it's not my car). Pretty sure it didn't, but I will check it more closely. Thanks...

 

[dragboat]

Jason, Thanks for the post! With results like this I might try this SS oil in the Wifey's commuter car. That is once the trash quits coming out during oil changes,man,never saw the likes of junk from assembly and maching as I have with this car!" Kia"

I hope I am not actually pouring the trash into it. He He! Doubt that's the case though

 

[MolaKule]

Dragboat,

I would sure change filters often while the cleaning is going on in the KIA.

Is there sand and metal chunks coming out? Maybe casting sand or if it's an aluminum block, a lot of ragged stuff will often flake off those aluminum/silicon alloys during breakin.

 

[sprintman]

dragboat sounds like a bottle of Auto-Rx would be the go. Clean it up properly.

 

[dragboat]

It was done with a full bottle early on,then 2 ounces per change there after,,RX is good stuff but believe the sand might be a bit heavy to pick up and take to the filter Plus could still be breaking loose as Mola suggests,never any aluminum chunks though,just bronze type machining metals and get this,a weird little chunk that would remind you of a piece or sliver cut off angle iron with a torch!..could kick myself for not cutting open the last filter removed this weekend,also could kick myself for sending in a analysis to Terry of oil with sand or what ever it is,should have held off until it drained clean,,oh well,local recyclers will be getting some pretty good oil for a while until cleaned up inside

I need a sand magnet for the oil pan!

 

[dragboat]

Molakule,Thanks,I will get some Walmart filters to use for a while. I recieved 20 of the OEM filters when I purchased the car,don't want to waste those things.

At first it was machining pieces of metal and sand like substance,now it is a sand like substance that can only be felt,not seen at the bottom of a very clean drain pan ,cleaned for this checking purpose only,car has 6700 miles,is on the 5th oil change trying to get this stuff out.
Kinda disappointed,this was the little car I was going to see how far it would go,no telling how much actual wear from this? Obviously not much need to put SS in it until clean,luckily it only holds 3.38 quarts with filter,so has not really cost much in terms of cash,just wonder about wear?