Castrol 10w60 RS7 Questions

[FranklinJL]

Put some Castrol 10w60 in my RS7 before a track day this last weekend. I ran 5 sessions, track temps were 109. Drained oil today, oil was very, very dark, and was much thinner than when I put it in 4 days ago. Should I send it off for analysis, or does this sound normal after hard driving? My car club buddy has a 911 GT3 running the same oil, ran all 5 sessions with me, and his oil looked brand new.....

 

[UltrafanUK]

Yep, we all love a quick UOA. If you don't have a set of universal averages use Blackstone Lab and it's good to get a TBN and see if there is a VOA in Google for this oil.

There are 2 versions of Castrol Edge 10w60, one is a real good high mileage oil for the go thick types and the other is for big booted boy racers who track their cars.

 

[Popsy]

+1, which Castrol 10W60 was that? There was some much versions over the years...

 

[FranklinJL]

Castrol Edge 10w60....the one approved for BMW M cars with the grenade motors

 

[Popsy]

Castrol edge Titanium FST maybe?

There was many reformulation, 2-3 years ago the Castrol TWS was known as a "thick" 50 (or a light 60), and supposedly shear to a 50 grade very quick.

If you want an oil that stay in grade longer, maybe try something like redline, or Motul 300V 15W50?

 

[d00df00d]

Originally Posted By: FranklinJL
Put some Castrol 10w60 in my RS7 before a track day this last weekend. I ran 5 sessions, track temps were 109. Drained oil today, oil was very, very dark, and was much thinner than when I put it in 4 days ago. Should I send it off for analysis, or does this sound normal after hard driving? My car club buddy has a 911 GT3 running the same oil, ran all 5 sessions with me, and his oil looked brand new.....

A UOA wouldn't hurt.

By the way, remember that your buddy's GT3 is naturally aspirated and produces less hp/L than your RS7. Wouldn't be surprised if it were a lot easier on its oil.

 

[Virtus_Probi]

Originally Posted By: d00df00d

By the way, remember that your buddy's GT3 is naturally aspirated and produces less hp/L than your RS7. Wouldn't be surprised if it were a lot easier on its oil.


Interesting thought...I have noticed that my relatively low performance turbo darkens oil very quickly (even when I don't put MoS2 in it ;^).
I'm also wondering if maybe the RS7's cooling system just wasn't up to tracking the car in such high temps?

 

[jdavis]

Do those really weigh around 4500 lbs?

 

[d00df00d]

Originally Posted By: Virtus_Probi
Interesting thought...I have noticed that my relatively low performance turbo darkens oil very quickly (even when I don't put MoS2 in it ;^).

Relatively low boost and/or volume, maybe. Not low performance, though. Still over 140 hp/L. That's not huge, but it's not small either. Somewhere between a base Veyron (125 hp/L) and a Veyron Super Sport (150 hp/L).

Your car's turbos are pretty small IIRC, so they must be spinning like demons at high RPM.


Originally Posted By: Virtus_Probi
I'm also wondering if maybe the RS7's cooling system just wasn't up to tracking the car in such high temps?

Well, it's not exactly a track car, is it?

First time I saw under the hood of an RS7, I remember thinking "there's no way this thing gets enough cooling." 570 hp from a twin-turbo engine pushing >140 hp/L, shoehorned into that cramped engine bay... Evidently it works just fine, but I can't imagine it works as comfortably as a real track-oriented car would. Big super sedans rarely do, let alone the ones with so much engine crammed into such little space.

 

[RooflessVW]

Oil becoming dark is an indication of nothing, and TWS is known to shear down a grade or two. I'd imagine you have some fuel solutions as well.

Nothing to worry about IMHO, I'm sure the oil did its job just fine.

 

[drtyler]

If you drained it hot/warm, it will be thinner than when you poured it in on initial fill.

Originally Posted By: FranklinJL
Put some Castrol 10w60 in my RS7 before a track day this last weekend. I ran 5 sessions, track temps were 109. Drained oil today, oil was very, very dark, and was much thinner than when I put it in 4 days ago. Should I send it off for analysis, or does this sound normal after hard driving? My car club buddy has a 911 GT3 running the same oil, ran all 5 sessions with me, and his oil looked brand new.....

 

[02SE]

FWIW, I prefer Redline 10w60 in my car which specs the Castrol TWS.

 

[FranklinJL]

Thanks guys I'm going to send it off, that's cheap. I drained semi-warm...not hot. Yeah its heavy, but with all wheel drive it's really fast around a track...I had the third highest top speed on the back stretch at 136mph.....don't know if the brake system is up to the task though...

 

[BrocLuno]

Brakes may be, but the fluid is prolly not. Boiling fluid means no brakes

 

[jayg]

Originally Posted By: Virtus_Probi
Originally Posted By: d00df00d

By the way, remember that your buddy's GT3 is naturally aspirated and produces less hp/L than your RS7. Wouldn't be surprised if it were a lot easier on its oil.


Interesting thought...I have noticed that my relatively low performance turbo darkens oil very quickly (even when I don't put MoS2 in it ;^).
I'm also wondering if maybe the RS7's cooling system just wasn't up to tracking the car in such high temps?


That's a stretch. Some engines just darken oil quickly. Some oil just darkens quickly.Color means virtually nothing.


That oil protected just fine and would be a waste of a UOA in my opinion. If somebody wants to pay for a UOA and read "Still has loads of TBN and could go longer" then be my guest.

 

[wemay]

I'm sure it was a blast. Glad you enjoyed yourself OP.

 

[weasley]

Depending on the specific GT3 model, it may be a difference in fuel injection. Direct injection tends to create more soot than port injection, which can darken an oil quickly (rather like a diesel). It is this phenomenon that could mean the introduction of gasoline particulate filters for future emissions controls.