mark kibort

7 race seasons, almost 100 race days and here is the oil report.

This time, i ran the 3 race weekend at laguna, the Time Attack at buttonwillow, a full winter of driving on the weekends, and the first double races at sears and the single race at Laguna.

What did the test tell???

NORMAL!!! infact they said, thinking that i hadnt raced with this oil change, that the oil looked even better showing that it looked like i hadnt been racing as much on it.

I have to think this Amzoil is some pretty good stuff, because lately, as you can see from the videos, i have not held back on trying to conserve the engine.

Ill see if i can post the report here as a jpeg

Mk

mark kibort

Here is the report

123quattro

How much do they pay you?

mark kibort

why? you are witnessing something really amazing, and you think im getting paid?
by blackstone? they just do the oil analysis
by amsoil? the just sell the oil?

Blackstone, sees thousands of samples, yet in mine that was raced more than heavilly, they respond back to say that any racing that i did, sure isnt seen in this oil sample . ("Your engine is taking it in stride") I dont know about you , but I am amazed.

For how much i beat on this 928, the oil is not showing anything unusual, even after 100 racing hours. I think there is something to be said for this.

mk

Black Sea RD

Mark,

Yes, truly amazing! Probably the only 928 out there that has survived this sort of use for so long.

I truly hope that when you decide to change engines you enlist the help of an engine builder to methodically tear down this engine to see if Porsche did anything special to it. Would be great to learn from them any secrets for long engine life, besides type of oil used.

Constantine

sweanders

How about doing the same test with a different brand of oil so that we can end this debate once and for all.

I am a believer in good oils, but not any specific brand.

aggravation

Maybe when you aren't looking your car is having a friend pee in the cup for him....

Stylemobile

I spilled my coffee from laughing so hard at this!!!!
Good imaginative writing.
See you all at SITM ! ! ! ! !

hacker-pschorr

Vlocity

Mark,

It would have been nice to see the remaining Total Base Number. I am also "trending" my oil for both of my Porsche's and my Expedition. The analysis kits in my store are similar but do include the TBN. Knowing the TBN gives you a good indicator of the "life" remaining in the oil.

Regards,

Ken

wds928

I've got pretty similar results on my GTS motor using Mobil 1 15w/50, with about 7,000 miles since the prior change the year before. Total mileage is 148,000. Mark's is just getting broken in. My flashpoint is 405 degrees F versus Mark's 470F with Amsoil. Also, my molybdenum is 100 ppm, Boron is 89 ppm. My oil's Calium is almost half of Mark's. Mark must be adding Fosamax each week.

Moral of the story is use good oil, change is regularly, keep it topped of, as these motors consume oil.

mark kibort

Ive always said that clean oil is important and our engines probably can run on Wesson oil and survive street duty. BUT, where mobil 1 fails, as well as others, is in racing conditions and i think we have shown this now. So, the Holbert motor might be a miracle motor, BUT, what about scot's. he has logged more racing miles than all the 928s racing in the last few years alone! (and he has nothing done to the engine. I know, i built it! not even an oil cooler)
What about my old 5 liter part euro? same thing. bone stock and a full season + of racing!

100 racing hours! (or 100 race days) thats a lot of abuse. at an average speed of near 60mph+ during those sessions, (usually fast lap average speeds are 80mph+) we are talking near 5000miles plus at rpms well over 5000rpm on average.
This means for 30mins at a time, the engine never sees an rpm lower than 4500rpm. Considering the much higher forces involved with higher rpm, and the cruise rpms on the highway at 70mph (near 2000rpm), you can guess the equivilant wear of racing vs highway use. Just the oil temps alone show 260F vs highway temps of near 180F.

What I did see when doing the comparison, was oil pressures fell on their face with mobil 1 at the track on a warm day. even the oil pressure light started blinking around slow turns and low rpms! this NEVER happens or has happened with Amsoil or Redline.

It will be interesting to see what is on the bottom of the Holbert engine. I highly doubt we will see anything other than stock stuff.

mk

sweanders

Is this with the same weight oil and same temperatures/cooling?

Any oil will get thin if heatead properly.

Also, the 928 has a fairly large quantity of oil compared to many other cars and relatively high oil pressure (a Porsche thing). Is the Holbert car running stock oil pressure?

mark kibort

I think all we need is to have a 928 raced a full season on an other brand of oil.
So far, this hasnt happened too successfully.
The Holbert engine has more race miles on it than any 928 original engine by a factor of 5x at least.

mk

mark kibort

same weight oil. both were 15-50 or 20-50 redline, amsoil vs mobil 1.
Valvoline racing saw simlar degredation of the oil pressure on scots engine vs redline and amsoil.

same car, of course, running in some type of stock 928.

yes, all oil gets thin, but we dont know about the foaming characteristics and viscostiy differences of the differerent oils at high temps. that, I think, is the real difference.

im seeing the exact same temps and pressures as i did in my old 5 liter part euro.

mk