Stupid OCI without UOA?

Messages
342
Location
Pittsburgh
I just got back from my trip to the Outerbanks and realized that I've already put 3kmi on my fill of M1 0w-40 and 15w-50. With 4 quarts and a turbo would it be a stupid idea to go 10,000mi on this fill and do one UOA at the end of the run?
 
Messages
951
Location
Loveland, Colorado
Hey Alex! [Cheers!] Man, that was a fast 3k! It's only been about a month, hasn't it? I'd say it partially depends on how quickly you roll up the next 7k. If you'll complete it before winter, then I don't think there's any concern that you're stressing this robust mix.
 

carrera79

Thread starter
Messages
342
Location
Pittsburgh
Yeah, I've been beating on the SAAB since I sold my other car. Maybe I'll even let this last tranny fill go till the oil change.
 
Messages
951
Location
Loveland, Colorado
Although, for the first time going this long, it might give you peace-of-mind to pull a UOA sample at 5k mi & swap in a new filter, then do another UOA at the end. That's what I'm doing on the 9³ right now. Then, when I'm convinced that the oil's doing well, I'll just go the entire interval. But my 9³ doesn't use any oil in 10k miles, so I get a little more comfort by adding a bit mid-way. Does your 900 need any top-ups? That could help it out quite a bit.
 
Messages
1,759
Location
Elizabeth City NC
I think on any oil the limit should be 7500 unless you have done a UOA to see how hard your engine beats the stuff up. I would not go 10,000. I went 7500 on one oil and did and UOA and found that 7500 was too much for this synthetic. I am trying another systhetic and will do a UOA at 6000 to see whats up.
 

carrera79

Thread starter
Messages
342
Location
Pittsburgh
Eiron, I might try that one out. It doesn't use any oil at all (knock on wood with 123kmi). I was expecting some usage with the full syn, but it hasn't used a drop. BTW-the 10w-40 in the trans is awesome. I was having a problem with the syncro for fifth (I had to give it a good pause or it would grind) with the drive clean it's shifting perfectly.
 
Messages
951
Location
Loveland, Colorado
Hey! Where's everybody else on this one? [I dont know] I certainly expected a bunch of input here. How 'bout you's guys with Swedish (Volvo/Saab) turbo experience? A quick search of the UOA section shows a ton of turbo owners. C'mon! I know you're out there!
 
Messages
1,251
Location
Akron, OH
The other great thing about doing a UOA before you start extending your OCIs is that it helps you catch weird stuff going on. My first UOA let me know that I had a antifreeze in my motor oil, albeit at trace amounts. As a result, I postponed my plans to run an extended OCI until I could verify that my engine was in good running order.
 
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