Just posted this in the F type area and thought I would get this going here it would be nice to increase the sample size at Blackstone.

For those with the 5.0, have you done an oil analysis yet?

I sent a sample to Blackstone and found out they do not have any averages for the V8 which is surprising considering they are one of the leading oil analysis companies in the US.

I have attached my analysis and I will basically invalidate it due to me not grabbing the sample when I drained so I have no idea where in the drain the sample came from, early or late in the drain can increase the amount of metals and throw off the results.

That being said I will be changing the oil every 7500 miles and will send another sample in for analysis.

If you are near Fort Wayne they accept drop offs that saves the hassle of dealing with the post office to mail used oil.

 

So what does this tell you? I like the idea of giving data points and all, but I'm not sure what you'd be able to do with the data.

 

I've had this done before on other vehicles, generally the presence of heavy metals indicates engine wear. It definitely helps to have a baseline with other engines of the same type, but if it was me I would do several of these and grab sample at each oil change after varying the mileage intervals. The purpose is to dial in exactly what the proper oil change interval is for your specific car based on whether you are at the end of the oil's life.

I did this back on my old TL-S and found that the factory MID's recommendations for oil changes was almost dead on with how often I should change the oil (I believe that car was 5500 miles). If I drove my car more I would do this but frankly I am hitting the time interval on oil changes before the mileage interval right now so I don't know that it would do much good.

 

Oil analysis has great value when performed on fleet vehicles that are constantly on the road. The idea is to take frequent samples from each and create an individual trend line. As the engine wears over tens or hundreds of thousands of miles or the health of the oil declines due to extended change intervals, any unusual changes in the trend can signal the need for an oil change or the need for engine maintenance.

Kinda like a humans getting blood tests tracking cholesterol etc.

Taking random samples at infrequent intervals and not having a base line to compare them to is of little or no value.

The OEM oil change interval is conservative enough to eliminate the possibility of 'wearing out' the oil for 99% of drivers.

 

Exactly this one basically tells me nothing mainly because I did not grab it during the middle of the drain and two because if I had grabbed it when I should have it would have been the baseline. Like I said above the next oil change will be at 7,500 miles to see what it looks like and I will adjust accordingly.

It would be nice if more people with the supercharged V8 did some analysis work so we could get an overall average going.

 

You could always post your results on bobistheoilguy in the
uoa section and solicit opinions.

With my particular personal, seeing those numbers,
I can skip that particular oil. It would not have been a candidate
in any case.

 

Here again to support my thinking that Vacuum extraction doesn't get it all out, as the heavy metals would be settling on the bottom of the pan, where, a drain plug drain would get rid of most of them.

 

I used the drain plug on this change, and will continue to do so. The previous owner always took it to Jaguar where they most likely used the pump.

 

Ah-Ha!! Awesome information reaffirming my suspicions. This one time you had it analyzed after you drained it via drain plug..means there were high concentrations on the bottom of the pan and you got them all in the last drain..making the analysis seem heavy on the metal particulates because it never has been drained like that before.

I be willing to bet, next time you drain it and have it checked, it won't be near as bad as this last time.

 

That all sounds plausible, but does having a fine layer of heavy metal particles on the bottom of the sump pan really have potential to cause a problem? In other words, do these particles settle and stay down the bottom of the pan and never circulate through the engine, or do they get stirred up and circulate? (PS - I don't have a pump and both oil changes I did on my old XFS I used the drain plug).

 

That's a darn good question and more than likely they do stay put on the bottom...But I have a feeling like you, that to drain it via the pan drain plug is to be safe and not wonder if...

 

The volume of metal particles on the bottom of the pan in a healthy engine is negligible. What is there stays put, so basically is nothing to worry about. Any particles of concern that do become suspended in the oil are caught in the filter before they can do harm.

It's standard practice to take an oil sample shortly after the engine has been run just to make sure that the contents of the system are 'stirred up' and not stratified in any way.

This means the method of extraction is irrelevant.

 

Says the usual pesky Mosquito..

 

So do they stay put or get stirred up?

 

The really nasty chunks stay put. The less nasty stuff gets caught in the filter. Neither is related to the purpose of oil sampling which looks for three things

1) changing trace levels of engine 'bill of material'

2) contamination from outside sources- coolant, water, fuel, dust

3) chemical deterioration of the oil and it's additives from overheating, short drives, high mileage etc.

Theoretically the oil sitting for a while could stratify slightly, so it's common practice to take samples consistently. The easiest way is to do this is pull a sample right after the engine is shut down and before any fresh oil is added as a top up.

 

Just remember I have NO IDEA where that sample was taken during the drain process because I forgot to take the sample while draining so I picked up one of my bottles with the used oil and dropped it off at their shop.

That can make a large difference and can be used either way on this argument.

 

If the engine had been running within a reasonable period of time prior to the oil being removed, it would make no difference if the sample was the last or the first bit to drain.

 

Sure it would if you grab it from the middle of the drain any of the metals that were near the plug would have been drained already. When ever I do my oil I let the car sit for at least 15 minutes so I do not burn myself which would allow some metals to settle to the bottom of the pan.

Again the next analysis will be a much better indication.

 

That's not the metal that's suspended in the oil, making it past the filter and circulating through the engine where it might do harm.

 

Just to clear up any confusion, this is from Blackstone Labs: