'02 WRX, 6k, Amsoil 10w30 ATM, OVERHEATED?

[OILNEWBY]

2002 Subaru Impreza WRX
90000 odometer reading
6000 on oil- I changed to oil
2-3 months on oil
SDF-20 oil filter
Fram air filter
no make up oil

Hello everyone. The first 2 set of numbers below is from my previous tests.

About 3k miles into this change the car overheated due to a blown radiator hose. I am worried after seeing some of the numbers more than double from previous tests.

Should I be worried about the engine?

I have always run this oil since the car was new and have always run it to this interval.


water 0/0
fuel !1/ viscosity @ 100C, 10.6/11.6/12.44

Oil Degradation

oxidation/5.6%/6.0/NA
nitration/15.7%/15.0/NA
TBN/7.4/7.57/7.34

Wear Metals

Fe/6/2/11
Cr/1/0/1
Pb/3/1/1
Cu/35/2/4
Sn/1/0/0
Al/7/2/4
Ni/1/0/0
Ag/0/00
Mn/2/This is not on my current report ???*
Silicon/7/7/10

Oil Additives

B/38/38/57
Na/3/3/10
Mg/338/854/863
Ca/3135/2078/2616
P/1279/1009/1131
Zn/1572 /1503/1443
Moly/0/1/0

 

[pitzel]

Looks great to me, too bad you didn't get any oxidation/nitration numbers. Did you use the same lab for all tests? Based on the numbers you have presented, I would aim for double your current OCI personally -- ie: try 12,000 miles as your next OCI. Don't be overly worried about the slight uptick in iron -- probably either a one-time event due to the overheating, or merely noise in the lab equipment.

 

[OILNEWBY]

Every test has gone thru Oil Analyzers.

Regarding the Oxidation and NITR #'s, they mentioned in the analysis that those numbers were unavailable whie they review test methodology.

I am glad to hear there is no earth shettering news with this report.

Thanks

 

[terminaldegree]

Depending on the extent of the overheating, I would be sure to change the oil immediately afterward-- just makes sense to me. Who knows how "cooked" that old oil was...

 

[The Critic]

Could the oil have thinned out when it was "cooked," thus causing higher wear, the spike in Fe?

Michael

 

[TooSlick]

I'd say the spike in Fe wear may in fact be due to the overheating condition. In addition the viscosity of this sample is significantly higher than for the last two. Most likely this was caused by temporary high oil temps resulting in abnormal oxidative thickening.

The oil did a good job of protecting the engine under these conditions, for example there is no evidence of excessive bearing wear due to high oil temps and low oil pressure.

These TBN's are consistently high and you could safely go to an 8000 mile, oil/filter change interval under these driving conditions. The ratio of nitrationxidation shows this is normally a hot running little engine ....

Tooslick

 

[Steve S]

The question I will ask is how long did you run the engine in an overheated condition. Now I will answer the question partly. I have been a mechanic, woops technition sorry, I have seen many engines with aluminum heads so overheated that the valve seats fall out and hold the valves open . Other than the problems with the valves seats and checking the mating surface to see if its warped the block is fine . I would also say the all the overheated engined for what ever it is worth were running a petroleum oil. Not that I am an expert is oil anaylsis but all the numbers seem low and as mentioned iron is a bit higher but is still very low. I have trouble interpeting the coolant level unless they are so high that the numbers stick out. Any way your engine seems fine .If it runs good it is probably ok.

 

[Stinky Peterson]

I don't see anything to worry about. I wouldn't call the iron a spike but instead a hiccup

. It may or may not be related to the overheating event.

I would be interested in knowing how long it was run? did it seize or did the gauge just go up? Sometimes there can be a problem that doesn't show up in the oil analysis just because it wasn't run long enough to generate wear particles. My advice is if everything is running OK then take another sample in about 1000 miles. In the meantime watch your coolant level closely to make sure it isn't going down and that there are no bubbles appearing. When you send in your sample tell the lab you are looking for coolant so they will do the chemical test for coolant instead of just the standard screening tests.

Good luck

 

[Al]

Very may be that the Amsoil saved your engine. Boron is up as is the sodium. Since Amsoil has no boron you might have gotten a small antifreeze leak which may have closed up. Too bad they don't give a potassium leak.

I would not run this sample overly long.

 

[Steve S]

I would Amsoil didn't help save the engine.

 

[OILNEWBY]

Thank you for all the reponses.

My wife was actually driving the car when it happened. She said she immediately stopped when she saw steam coming from under the hood. She told me that when she saw the steam she looked at the guage and said it was in the red.

I would have to say that it wasn;t run too long in the red, knowing the size of the hole in the hose and how hot the car run with the turbo (the underhood temperatures are pretty extreme with the turbo out in the open.

The car seems to run just fine, so it looks as if I got lucky.

Thanks

 

[Steve S]

quote:

---

Originally posted by OILNEWBY:
Thank you for all the reponses.

My wife was actually driving the car when it happened. She said she immediately stopped when she saw steam coming from under the hood. She told me that when she saw the steam she looked at the guage and said it was in the red.

I would have to say that it wasn;t run too long in the red, knowing the size of the hole in the hose and how hot the car run with the turbo (the underhood temperatures are pretty extreme with the turbo out in the open.

The car seems to run just fine, so it looks as if I got lucky.

Thanks

---

Mrs.OILNEWBY did good.

 

[TooSlick]

The Amsoil 5w30/10w-30 and 0w-30/20w-50 Series 2000 formulations all contain 60-80 ppm of boron. This additive is depleted through use and can be used to evaluate when the oil has reached the end of it's service life. I generally flag an analysis when the "B" reaches 25% of it's baseline value.

Note that boron is a multifunctional additive and is used as both a friction modifier and anti-corrosive. Boron actually has a microscopic "rod like" structure and significantly reduces friction under boundary lubrication conditions. Amsoils main engine oil, additive supplier - Lubrizol - favors boron over MoDTC, but both types of friction modifiers seem to work very well.

Tooslick

 

[buster]

quote:

---

Amsoils main engine oil, additive supplier - Lubrizol - favors boron over MoDTC, but both types of friction modifiers seem to work very well.

---

Mobil must favor both.

276ppm of Boron
80ppm of Moly.

I don't see what is wrong with this report. It's fine.

 

[TooSlick]

Buster,

I think Mobil is using the boron for a different purpose than is Amsoil, in fact I don't think it's in the same chemical form...

There are several different types of borates used as oil additives, so things are never as simple as the BITOG crowd would have you believe.


Ted

 

[buster]

quote:

---

Buster,

I think Mobil is using the boron for a different purpose than is Amsoil, in fact I don't think it's in the same chemical form...

There are several different types of borates used as oil additives, so things are never as simple as the BITOG crowd would have you believe.

---

Could very well be...

http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=4;t=000177

Molekule wrote an excellent article about Boron above. He stated Mobil MIGHT be using "phosphorilated borons".

[ May 03, 2005, 05:23 PM: Message edited by: buster ]

 

[TooSlick]

Buster,

I noticed the Amsoil Multi Purpose, spray grease has something called "Antimony Dithocarbimate" in it. Is that also an EP additive or is it a FM? I honestly have no idea and I'm too lazy to do a search.

BTW this is the far and away the best Amsoil product to use on screw type garage door openers. I've tried all the Amsoil spray lubes on this door and the spray grease is much better than the HDMP or original Amsoil MP spray lubes for this application. The HDMP causes a horrible squeaking noise in cold weather since it turns to wax....

Ted