All,
Just for grins I had the oil sample burned for my 03 Vert. I used the same guys (AOA in Phoeinix) who do a great job for my plane (77 Mooney). I have used Mobil-1 5w30 from day one and have changed the oil at 10% DIC life remaining. It is a daily driver with mostly stop-and-go traffic or interstate cruising. 7,200 miles on the oil, 32,000 on the engine. The values came up 19 ppm (high) for chromium, 491 ppm (way high) for lead. The really weird one was 18 (6-9 would be normal) for viscosity)

I'm not worried, but I don't know if they have a clue about synthetic oil (Mobil-1)

Oh, yeah, I did tell them this was from a car, not a plane!

Probably a waste of $11...

Gunner

 

Hmm, where is that lead coming from?? stop running aviation gas in your car!! lol j/k rather then judging the content, is your system using any oil during the course of the liffe of one change?

Shane

 

7200 miles is a whole lot of miles on an oil change, even M1. I go about 2000 and out it goes! I feel doing oil changes often can only be good for the motor, but going longer can definately cuse wear & only hurt it!! Just my opinion!

 

GM spent a lot of money and honor waranties including extended GMPP based on the oil life algorithms built into the DIC. If you change at 10% remaining life you have lots of cushion.
I run my Cadillac NorthStar engine for 11,000 miles bewteen oil changes on Mobil 1

 

Even for those that want to be conservative, 5k miles is a good round number to use.

 

A better way to go on this is send it to Blackstone and for $40 get the #46 Dyson analysis. I do this every year. Terry Dyson will get a copy of your report and provide you interpretation and feedback. Your lead is very high, almost unbelievable. How was the copper?

Also, my reports greatly improved with the German Castrol 0W-30. I don't like Mobil-1 due to its low viscosity at 100 degrees C. It is almost in the 20 weight range and I prefer an oil in the upper third of the 30 weight range.

 

I have three vehicals I change oil on. 2 corvettes and a 1500HP SIlverado. I also do regular oil anaylses on each vehical by two different companies.

One vett, is my wifes 2004 with only 8000 miles on, I did an oil change at 1500 miles and 5000 miles. Nothing to exciting to report. But that 3500 miles was about right, DIC said 30% remaining. M1 5-w30

The SIlvardo is an 04 with 42,000 miles. My DD and tow vehical. I change the oil about 4,000 miles and 30% on the DIC. Oil testing says change sooner as that is too long between changes. Do about 3,000 miles. M1 5-30

My vette is my track car, sees 3000 to red line all the time, oil temps always in the 250-265 range. Driven very hard. I change the oil every two weekends on the track or about 500 miles. Oil goes in and I reset the DIC to 100%. after one weekend the DIC is down to 70% after two weekends it is down to 40-35%. Oil is changed. M1 0-w40 Dec to Feb and M1 15-W50 March to Nov. On another note this car has the cleanest oil, the cleanest burning and best running of the three.

The oil life algorithms built into the DIC computer are very good and are based on how hard the engine is run not just the milage.

From looking at our three different vehicals and use of each, IMHO 30% on the DIC is about as low as I care to go, no matter how many or few miles.

Dont try to be a hero and see how far or long you can go between oil changes.

 

I say your 11 dollar analysis was a waste of time, with lead number like that it would indicate your bearings are in the oil pan.

75000 miles seems long to me with 10% left, unless you are a coast to coast salesman driving at a sustained speed for many hours.

I average between 3500 and 4200 miles between oil changes.

A better way to go on this is send it to Blackstone $40. It's a very respected company with in depth analysis. Many member have used this service, and most will agree the DIC is alittle conservative...GM put a slight safety factor in the DIC algorithm, I take my car down to 1% and get the oil and install it within the week.
Good Luck Bill aka ET

 

According to the Blackstone barometer your Chromium is WAY high also. Blackstone does mine and they claim the "Universal Average PPM" for an LS1 at 4,200 miles is Chromium 1 (yours was 19) and Lead 10.

As others have suggested I would retest and use Blackstone. www.blackstone-labs.com

MTCW. Bob

 

Gunner,
Those results would have me a little concerned as well, particularly the lead, chromium and the viscosity (which should be between 9.30 and 12.49 for a 30 weight) as you noted.

For comparision for you, on this page of my website is a series of four oil analysis reports of a fellow forum members 99 C5, two with German Castrol 0w30 and two with AMSOIL Series 2000 0w30:
Corvette C5 Used Oil Analysis Comparison - AMSOIL Series 2000 0w30 vs. German Castrol 0w30

All four of these were done with Blackstone labs. I'd suggest you get another sample and send it to Blackstone and see if they compare to your first results.

 

7200 miles is not very long at all, that would be a short interval for me.

I went 9k on my last interval (using German Castrol 0w30) and the wear numbers came back very low:

Iron-11
Lead-2
Copper-2
Aluminum-5
Chromium-0
Nickel-0
Titanium-0
Silver-0
Silicon-11
Viscosity-12.4 cst at 100c
TBN-5


I think something is amiss with this particular oil analysis result (of the topic starter, not mine), I've never seen one this bad so I think either the lab screwed up or the sample somehow got contaminated in transit. I would do as others suggested and send the next sample to Blackstone and get Terry Dyson to interpret the results. I've been having Terry interpret my results for me for over 4 years now with awesome results.

Also, don't let anyone make you think you need to change your oil every 3k! Once you get Blackstone to do your next analysis, they'll let you know it's safe to go well beyond 3k if your engine is ok.