I've got a 25 Qt system in my RSR with a 3.6L engine.

Our ol' 944 and 924S have 5qts and 8qts respectively. We
also endurance race these -- so a weekend per oil change
makes sense both economically and hours on engine wise (14-24 hours).

How often should I expect to run the RSR on a batch of oil?

Since i have access to the dry sump - is there samples and
a kit or something I can check the status of the oil.
Sure a kit might cost a little -- but we're talking 25QTs

I don't care how many deals I find on oil -- that's still pretty pricey.

I know the engine is worth a ton more (as is my time since
I know what it takes to rebuild one) -- but still.

Thanks,

Mike

 

I run 12ish hour intervals on my cup car using redline...and it could safely go a lot more...with 25 quarts I would send in a sample at 12 hours and evaluate from there...every engine is different but i wouldn't see a problem running 12 hours assuming you are using a high quality oil. use Stavely or Blackstone Labs and start a database of oil samples going forward.

 

I run around 20-25 hours on a 3 liter with 15-16 quarts.

 

7 quarts and I change it after every race weekend. About 6-8 track hours. Probably overkill but relatively chaep insurance, plus my car tends to run a little warm.

 

holy ****... thats a hideous amount of oil to change... Do you purchase by the drum or tanker?

~10 qts in my 6.7l small block and while I let some out after every track day to check it, it only gets changed every 8-10 hours

Just examine it after every event and if its still nice and oily and then you should be good

 

You're kidding, right? What is "nice and oily"? You can't examine oil visually or by touch and make any valid determinations.

Scott

 

I think he meant the underside of the engine.
If it's not oily -- there must be something wrong -- it is a Porsche of course :-)

The extra 10 qts are the 007 option to deter tail gaters.

Mike

 

I change mine every other race using Mobil 1 15W50 synthetic just for proactive safety.

 

My car: 8 hours and change the 15 qts

 

I did mean that as a joke but unless you are blind its easy examine oil to see if there are metal flakes or unusual discoloration

 

No, that is just plain wrong. You can be having severe wear problems and not be able to see any particulates with the naked eye. Oil can look terrible and still be just fine.

The ONLY way to examine oil properly is through lab testing.

Scott

 

Best to send it for oil analysis (like at Blackstone) otherwise you're just guessing.

Marc

 

I have used them before and their turnaround is relatively quick and you get a nice pdf emailed to you with major stats for the oil.

 

I often forget my lab testing kit at home so I am forced to check my oil the way non-pro motorcycle/car racers and Baja 1000 teams have done for decades... If it looks remotely like it did when you filled it, and it hasnt been X amount of hours, then it should be fine.

Scott, what I am trying to convey is that its a good idea to just to take a look at the oil to make sure there are no metal shards, coolant, or random crap in there.

8-15 hours is not an eternity for engine oil... If you go to all that trouble of having it analyzed you might as well just change it and be done with it.

 

We aren't talking about the Baja 1000 here, are we?

When you have upwards of 6 gallons of Red Line racing oil in your oil system, you don't want to change it "just because". At least not if you don't have unlimited funds.

Scott