I am talking from personal experience. Not from what someone on bobtheoilguy.com has told me or imakenews.com.

The actual facts and data from the imakenews.com article were collected from one of BP Lubricants' expert analyzing the Royal Purple product. I don't want to start an argument here but you really need academically approved sources to convince me that Royal Purple is a scam, especially since I've been using it in a 1993 Toyota Supra TT since it was bought by my father in 1994. At 90,000 km everything is still running FLAWLESSLY. No leaks whatsoever, nothing mechanical has been done to the car in nearly 20 years on the road and all it has seen is Royal Purple lubricants.

Personal experience with no lab results of used oil samples? show me some lab tests on used oil samples that show it did well without any high sheering, or metals, let me know. Till then it's just your opinion with nothing backing it.

Jeff_B | Bestcovery

And how is Jeff_B, a Business Administration graduate from USC who enjoys poker, drums and video games, and who also made some Best Picks for flat-pannel display mounts, digital cameras and PDF readers an academically approved source who has conducted research based on academically approved citations?

Never said it was. Just posted it as he points out why PP comes in 1st in most of peoples opinions. It's the cheapest, but also provides the best UOA's.

You are deeply mistaken. I will agree with you that RP is not the best 'bang for buck,' so to speak, but if you're willing to fork over the extra Benjamins, you're in for one of the highest quality lubricants in the market.

Laugh.

so where's the facts about royal purple....instead of arguing...just post up some info on it....lol

oil is a sensitive topic.....

^^ I agree.

To keep this Z related...UOA on Z's...

VQ Oil Analysis and Info - MY350Z.COM Forums

Copy and Paste..

Originally Posted by Resolute View Post
Here's a comparison chart I've made to highlight oils whose results, when averaged according to engine wear for every 1000 miles of use, stand out as a significant statistical difference from the mean. I divided the engine wear for each metal by the mileage for each and every UOA I have, and then multiplied that by 1000 to generate a ppm for every 1000 miles driven. I then found the average for each wear metal (iron, copper, etc..) for all the UOA results and the standard deviation of each wear metal result from the average. This chart shows the average wear for each current oil tested in terms of ppm/1000 miles. The cells with a green background are better than one standard deviation from the average. The cells with a red background are worse than one standard deviation from the average. The average and SD, remember, is calculated from ALL the samples I have from the VQ. The average wear characteristics of some oils used in the VQ which are no longer in production I have also included in a separate table.

The interesting thing is to note which oils are statistically significant in terms of better or worse wear from the universal average for each wear metal. It would be nice to have multiple samples from some of these oils before the manufacturer changes formulas again.

http://i265.photobucket.com/albums/i...Comparison.jpg

just stick with what you like and don't rub it onto other ppl.....this thread is turning into a religious ppl trying to convince you to convert thread...lol


the point of the thread is for the guy to change his oil ASAP b/c he has sludge in there....done

Castrol Syntec 0W-30/5W-30 did good from that chart

Castrol makes good quality oils. Especially the German Castrol.

i've been using it for awhile..... i used regular Castrol on one car to see how long it lasts.....25K til white foamy stuff starts coming...lol

NO PERSONAL ATTACKS!:mad: If you dont' agree with someone, simply reply WITHOUT attacking or harassing the person or just ignore it. You can also keep things pm.

results from
http://www.blackstone-labs.com
http://www.dysonanalysis.com/index.html

all cars were 350z's

All the data collected together


http://i422.photobucket.com/albums/p...ame007/UOA.jpg

http://i422.photobucket.com/albums/p...me007/UOA2.jpg

http://i422.photobucket.com/albums/p...me007/UOA3.jpg

results from a 08 G37 with Nissan's 5W-30

http://img16.imageshack.us/img16/3263/oil1.jpg



and results from same car at 2nd oil change...same oil too

http://img16.imageshack.us/img16/4067/oil2r.jpg

Your kidding?! If not.... :bowrofl:

where do these elements come from:

Iron: Comes from cylinder liner, camshaft, oil pump, and timing chain wear
Chromium: Comes from piston ring wear
Copper: Comes from bearings, valve guides, and bushings wear
Lead: Comes from bearing wear
Aluminum: Comes from piston and piston thrust bearing wear
Silver & Tin: Comes from bearing wear
Silicon: dirt ingestion, sometimes used as an anti-foamant
Molybdenum: anti-wear additive and friction reducer
Boron: anti-wear additive and friction reducer
Calcium: common additive with many functions, primarily a detergent
Magnesium: common additive with many functions
Phosphorous: anti-wear additive and friction reducer, shear stabilizer
Zinc: anti-wear additive and friction reducer, shear stabilizer

Link to this massive write up

it's true......when a car gets old..sometimes you just have to stop paying up for repairs and maintenance....that's what i did


it was a '90 Grand-AM btw


it was still able to run, it got so bad that the dip stick was rusty...
:bowrofl: :bowrofl: :bowrofl::bowrofl:

LOL! Love it.

well, from all this...i'm sticking with Castrol....

what r u sticking with?

Just curious what it is on the graphs posted on the previous page that proves Royal Purple is one of the worst oils you can get. Seems like it did just fine to me.

I mean come on, worst oils you can get??

It would seem the subject of what oil to use is as controversial a topic as whether the automatic or manual transmission is "better" and the number of opinions and favorites seem almost endless.

For me, I'm going to continue with Nissan Ester oil.

I know there are a lot of good wrench turners and "engineers" out there withe their own various opinions and reasoning, but I figure that if Nissan engineers recommend using the Nissan Ester oil, there is probably a good reason for it - plus my 370 does seem to run quieter and the engine oil a bit cooler since my last oil change with the Nissan recommended oil. :)

once the engine knocks start coming, then it's good to use Nissan Ester oil.

a few G37's had knocking issues and that fixed it.

Nismoz&007
 

Looking at the post by 007 it seems that the TBN of Mobil 1 7500 is really low for an extended change oil. Also, several folks have commented that Nissan ester must be the best because Nissan recommends it. It may be however, just because a company recommends the oil they sell does not mean it is best. Nissan's only concern is that the engines make it through the warranty period. I am not saying that it is not the best but we just don't know yet and I don't always trust companies that are buildiing for a specific price point in the market. If the engineers were giving you the best info on the 370 then we would not be having issues with oil temps because they would come with a cooler whether some think they need it or not...This is a sports car.

There are threads on this and other sites explaining why an ester based oil it needed for the 3.7; it would probably be a good idea for you (and everyone else) to look them up. The reason the oil is needed has to do with the softness of the metals in this engine and the bonding properties of the ester based oil....in other words, it isn't simply because Nissan sells the oil.

Robert
 

I have read numerous posts here and on bobistheoilguy.com however, there are not any tests I have read that compares Nissan ester with other top group IV or V synthetics. As I said, it may be the best but would like to see long term wear tests which, it is too early to assess. I understand the logic about the bonding of ester with the coatings in the parts but not sure if any other top rated Group IV or higher would do as well. There are many different ways to skin a cat and just looking at one factor may be short sighted. I agree with the logic that Nissan uses but just not convinced that something else might not do as well or better. I guess I would like to see the ester compared with other oils long term however, in the meantime, it may seem prudent to use the ester.

You can call me NoGood instead of 007....lol


There is a reason why some ppl use ester oil. It prevents and stops knocking sounds the engine will get. Has to do with the VVEL actuators.....something like that.

JobbersWorld Online

Quaker State Publicly Challenges Castrol, Valvoline and Mobil 1


For those who picked up USA Today, you may have noticed that Quaker State ran a full page piece (page 8A) challenging Castrol, Valvoline & Mobil 1. In large type, it says:

"HEY CASTROL, VALVOLINE & MOBIL 1: IF YOU CAN PROTECT AGAINST WEAR BETTER, PROVE IT. "

The challenge is followed by a letter from Steve Harman, President, Americas delivered today to the executives responsible for Mobil 1, Valvoline and Castrol. Click here to read letter.

Interestingly, when you consider Pennzoil's position in the story that follows regarding "statistically indistinguishable" differences in Sequence IVA wear test, it would appear Quaker State may already know that outcome of its public challenge. That outcome being Valvoline, Castrol, and Mobil 1 can't prove it with "good science."

At the same time, the Quaker State challenge will likely increase pressure on ExxonMobil to respond to what both Valvoline and Castrol have publicly stated are very significant differences in Sequence IVA performance when comparing their synthetic 5W-30 engine oils with Mobil 1


Shell Says the "Xs" in Sequence IVA Are Bad Science and Misleading


First it was Valvoline. In July of 2008, it claimed the company's SynPower motor oil provides 4X better wear protection than Mobil 1 in the Sequence IVA wear test. Then Castrol literally jumped into the game with an advertising campaign rolled out during the SuperBowl saying that Castrol EDGE offers 8X Better Wear Protection Than Mobil 1 in the same test.

With Valvoline and Castrol making such bold claims, one of the big questions asked is, "How much better its Pennzoil Platinum when compared to Valvoline, Castrol and Mobil 1? To get answers, JobbersWorld decided to put this question directly to Shell. Here is what we found.

According to Selda Gunsel, Manager, Lubricants Technology Group, Shell Global Solutions (US) Inc., "Although Pennzoil Platinum performs exceedingly well in the Sequence IVA wear test, the battle of the "Xs" comparing oil against oil rather than oil against spec is one we are staying out of." And Gunsel says, the reason they are is because it's "bad science" and could be misleading.

To understand what Gunsel means starts with an understanding of the Sequence IVA wear test.

The Sequence IVA is an engine test designed to evaluate the performance of engine oils in preventing camshaft lobe wear in an overhead camshaft engine. It's a 100-hour test of 100 hourly cycles. When completed, each of the 12 cam lobes in the test engine is measured for wear at 7 points. An average is calculated based on the total wear from the 12 cam lobes. In short, test results with a higher number means higher wear.

For an engine oil to qualify for API SM/ ILSAC GF-4 rating it must pass the Sequence IVA with an average wear of 90 micron maximum.

Now for the part about "bad science."

According to Gunsel, "considering that one standard deviation from the mean in the test is 12.5, there is no statistically significant difference for test results within 35 microns of each other."

Based on data published by Valvoline, whereas Valvoline SynPower showed an average of 20 microns in the Sequence IVA wear test, Mobil 1 5W-30 averaged 180 microns. If Valvoline's data is correct, Gunsel says, "This is certainly a statistically significant difference." Moreover, it speaks to the basic pass/fail threshold of 90 microns or less required to meet SM/GF-4.

But moving beyond the issue of does it or doesn't it when it comes to Valvoline's claim about Mobil 1's score in the Sequence IVA, Troy Chapman, Marketing Management Team Leader Pennzoil Brands with Shell says the comparisons move to another level when you look at the Sequence IVA tests results for Shell, Valvoline and Castrol in the Sequence IVA. Troy notes, "you are no longer comparing a result of 180 microns with 20 microns. Instead, the comparison is being made between three brands each with less than 20 microns of wear in the test." This moves the comparison into and area where differences are "statistically indistinguishable." (See Graphic that follows)

Chapman adds, "This is why it would be bad science for Shell to add its bar to a chart, or say X times better when comparing Pennzoil Platinum with Mobil 1, SynPower and Castrol EDGE." Not because their average in the Sequence IVA (which Gunsel says is less than 20 microns) would not comparable very favorably with what Valvoline claims is Mobil 1's average. "Instead," Troy says, "it's because consumers may get the message that the comparison is also between Pennzoil Platinum, SynPower, and Castrol EDGE. And that would be a mistake." First, it would be misleading since there is no statistical difference for test results below 35 in Sequence IVA. Secondly, by spending time with statistically insignificant and misleading comparison, consumers may lose focus on such issues as cleanliness and others where there are true performance differences in engine oils.

Could you post a picture of the black powder maybe by rubbing the dipstick on a clean white paper towel? Almost every new car will have some minor silver / black color residue- Back in highschool, i used to work at one of those quicklube places and have seen the oil come out of 1000+ cars. Virtually every car with less than 10,000 miles will have that.

However, even if the black powder isn't due to your oil overheating, in your case, I would suggest an oil cooler anyway asap. 250F is very high for regular daily driving compared to most other 370Z's espescially if it happens all the time.