Average reading from Blackstone Laboratories with my oil analysis on my ‘11.5

[NitroBiz]

[edycol]

I would not add 2000 miles. Blackstone always say that.
Oil sheared a lot if it is 10W60. Which oil are you running? I cannot see here.
Also, flash point is not exemplary.

[kyrix1st]

Shorter OCI is the answer for hard driving. There is a reason why racecars change fluids after every race.

[edycol]

Originally Posted by kyrix1st

Shorter OCI is the answer for hard driving. There is a reason why racecars change fluids after every race.

Not necessarily. I have seen excellent reports on some heavily tracked cars after 5,000 miles. I recently saw UOA of Corvette C7 using Motul 0W40 300V with ridiculously low wear and shear.
The reason why in actual racing oils are changed after every race is:
1. No dispersants and detergents in those oils. That allows less evaporation loss during the race. However, oils like that oxidize a lot.
2. Depending on the type of race, some oils are as thin as 0W8. Extremely thin oils have less parasitic loss=more performance.

[kyrix1st]

Not a good comparison as the S65 has half the journal clearance of the tightest engines out there, any debris resulting from the oil bypass during the cold start
will be detrimental to these engines. Fuel dilution is also a problem with loosely built piston rings on these engines.
Same reason albeit different part is the IMS for M96/7 engines for Porsche, Jake Raby (a renowned engine builder for flat six crowd) did some extensive testing to recommend 6 months/3-5k miles to maximize bearing life.

Originally Posted by edycol

Not necessarily. I have seen excellent reports on some heavily tracked cars after 5,000 miles. I recently saw UOA of Corvette C7 using Motul 0W40 300V with ridiculously low wear and shear.
The reason why in actual racing oils are changed after every race is:
1. No dispersants and detergents in those oils. That allows less evaporation loss during the race. However, oils like that oxidize a lot.
2. Depending on the type of race, some oils are as thin as 0W8. Extremely thin oils have less parasitic loss=more performance.

[Scharbag]

Originally Posted by kyrix1st

Shorter OCI is the answer for hard driving. There is a reason why racecars change fluids after every race.

The S65 is just a V8. There are lots of V8s in racing that get oil changes once per season. Not every race. Oil is really stout today.

[kyrix1st]

Originally Posted by Scharbag

The S65 is just a V8. There are lots of V8s in racing that get oil changes once per season. Not every race. Oil is really stout today.

Depends on which race you run really. Guys who run 8h+ endurance races change their fluids every race.

[edycol]

Originally Posted by kyrix1st

Not a good comparison as the S65 has half the journal clearance of the tightest engines out there, any debris resulting from the oil bypass during the cold start
will be detrimental to these engines. Fuel dilution is also a problem with loosely built piston rings on these engines.
Same reason albeit different part is the IMS for M96/7 engines for Porsche, Jake Raby (a renowned engine builder for flat six crowd) did some extensive testing to recommend 6 months/3-5k miles to maximize bearing life.

So you do UOA and see where are you. But if you are talking actual races, change also rod bearings.
The track is a different story.

[edycol]

Originally Posted by kyrix1st

Depends on which race you run really. Guys who run 8h+ endurance races change their fluids every race.

Yes, it is case by case. Depends on which oil too. If you are talking actual races, oil choice will depend on each track, weather conditions, track itself, and strain that puts on the vehicle.
Some race you bight run 5W30 oil, some 15W50.

[kyrix1st]

Originally Posted by edycol

So you do UOA and see where are you.

I would love to do that with my 6MT racecar, except it is half an earth away and I don't race my DCT in the States(yet). Below is my DCT, like I said I don't see a problem going 3k miles with moderate use.

Originally Posted by kyrix1st

[Scharbag]

Originally Posted by kyrix1st

Depends on which race you run really. Guys who run 8h+ endurance races change their fluids every race.

We run 24 hour races. We do not change every race. Partially due to the fact our little hondas use more than 5L of oil every 24 hours...

The Super Late Model guys run an entire season on their oil. This is on Chev 694 crate motors that run WOT most of their life. A season includes practice, quali and races. These sealed 5.7L V8s last for many seasons and given they are sealed, nothing gets changed over their lives. Yes, 5,800 RPM is a lot less than 8500RPM, but changing oil too often is just a waste of money.

Cheers,

[edycol]

Originally Posted by kyrix1st

I would love to do that with my 6MT racecar, except it is half an earth away and I don't race my DCT in the States(yet). Below is my DCT, like I said I don't see a problem going 3k miles with moderate use.

It does not have TAN measurement.
Do not get me wrong, looks exceptional UOA, but to have the full picture of oil, you need TAN too. The difference between TBN and TAN is a basic measurement of how oil does.
As for wear, UOA is not designed to show you exactly how your engine does. It can point to an issue that requires further investigation, but that is it. It can point to let's say known issues, like rod bearings, but UOA is about oil, not an engine.
So you really need TAN too. If TAN and TBN are close (let's say TAN is 3 and TBN 3.3) oil is done. If TAN exceeds TBN, it is definitely time to change and you already have excessive oxidation. This is particularly important with race oils as they usually have a lot of esters, and esters are highly oxidative.

[edycol]

Originally Posted by Scharbag

We run 24 hour races. We do not change every race. Partially due to the fact our little hondas use more than 5L of oil every 24 hours...

The Super Late Model guys run an entire season on their oil. This is on Chev 694 crate motors that run WOT most of their life. A season includes practice, quali and races. These sealed 5.7L V8s last for many seasons and given they are sealed, nothing gets changed over their lives. Yes, 5,800 RPM is a lot less than 8500RPM, but changing oil too often is just a waste of money.

Cheers,

I have recently seen C7 Corvette UOA on Mobil1 0W40 ESP and one on Motul 0W40 300V. It is probably the best UOA I have seen in a long time on oil that did 5,000 miles in a car that lives on the track. The only reason why oil had to be changed was TAN as both oils have easters, but KV100, TBN, flash point, all indicated that if oxidation was lower, oil could do more. Interestingly, 300V although it has much more esters, had bit lower TAN than Mobil1.

[pjk380]

Originally Posted by edycol

I would not add 2000 miles. Blackstone always say that.
Oil sheared a lot if it is 10W60. Which oil are you running? I cannot see here.
Also, flash point is not exemplary.

Yes, what oil are you running? I hope you are not running 5W40. 10W60 should not shear down to 5W40.

[edycol]

Originally Posted by pjk380

Yes, what oil are you running? I hope you are not running 5W40. 10W60 should not shear down to 5W40.

But it does. There is too much VII in them.
The smaller spread between numbers before W and numbers after, the less shear. So 15W50 will shear less than 5W50 if the same base stocks used.