Thanks to this place I successfully changed the SC oil in my XJR100 about a month ago. The car just rolled over 60,000 miles, but the fluid was dirty as could be. I felt great to pour in the nice new clear fluid.

Not sure if many of you use Blackstone, buy I do and always like knowing what's really going on in the blood of my engines. I sent them a sample of the used SC fluid and got the below report, figured I would share it for everyone's benefit. Looks like even at 60k it was ready for an oil change.




Old fluid coming out!





Nasty old fluid!





New going in...





Report on the old fluid

 

Well, that is certainly interesting, but I assume they mean the rotors when they say "screws" and they sure ain't iron. And if the bearings (or gears) are shedding a lot of iron, you probably have some other good size problem. So... I wonder what is really going on?

 

With 60,000 miles on the original oil, I wouldn't consider that iron level high by any means. Most of it was probably generated in the first 1,000 miles or so of the initial break-in.

 

Drawing any conclusions from a single sample of oil is dangerous. Kinda like a doctor prescribing surgery based on a single blood test.

 

All I know is that I change it every 30k; whether it's on a GM, Jaguar, Mercedes, whoever. You just get better lifespan.

 

Is short supercharger life a thing?

 

Yeah, I am wondering better lifespan than what? I have two 200,000 mile superchargers and at least one of them beat the car's paint and general appearance.

 

No, but the components in the oil bath in the snout do wear at an accelerated rate with crap in the oil.

 

Did Blackstone know the baseline of this particular lubricant to be able to provide any meaningful comparison?

I ask because on some of the Buick, Pontiac and other 3800 series forums that discuss these SCs in-depth, it has been pointed out that the SC oil is not normal engine or gear oil, and is a particular blend. So the analysis may not be unusual for this SC oil, even if it is unusual for motor oil.

Many have wondered what is so special about this SC oil, so maybe this analysis is simply identifying some of the key additives?

Would be interesting to know.

Thanks for having it done, very interesting

.

 

It's basically jet turbine oil if you look at the alternative
part numbers.

Gears spinning at 3 times engine rpm with no direct
cooling of the oil, and not very much oil to begin with,
I'd say it's a severe environment worthy of regular
oil changes.

 

Yep, and given how easy it is to do, why not

.

 

If you derive joy from knowing that you have done all you can to add life to your Jag-u-wah, there is no reason not to change the SC. Heck, I have changed my SC oil (at 150,000 miles). BUT... how many SC failures related to the gears spinning at "jet turbine speeds" are reported? The answer is NONE. Couplings, yes! But I doubt oil will save a coupling.