emry

Which means what? Using the same MTBF for all those parts and fluids regardless? If not, where did you get MBTF=50000 to plug it in your sheet?

b.t.w. what's the unit of measure for this MBTF=50000? Hours, Years, Months, Feet??? Just don't tell me you used 50000 hours MBTF for an aircraft engine and arrived at 14757.76476 hours for oil change interval

That's because those numbers don't exist and that MBTF does not apply to oil at all. That's why you can't get it.

rockstar143

iTrader: (6)

emry

At least you got that point right. Yes I am only interested in knowledge gain and sharing on RDX. Not trolling around posting thousands of comments none being relevant to cars.

I don't recall having sent an invitation to you and other trolls to this tread. So if you don't like what you see in this tread why not just leave.

At least he made an attempt. But what has been your contribution ever to this forum thru your thousands of postings? Can I add you to my ignore list like other trolls?

cu2wagon

You can certainly add whomever you choose to your ignore list if that makes you feel better and/or you can't handle *reading* what someone says that you may disagree with.

That being said, there are no boundaries or compartments that people need to stay within here. Anyone can comment on anything unless the thread gets locked by a mod/admin. But what's the point of that then?

And, you may want to reconsider being so judgmental about what others have or have not contributed. In fact, there are a lot of members that you may find disagreeable but who are quite knowledgeable. In another fact, a lot of them have become disagreeable because of attitudes like yours. When new members come in knowing it all and are unwilling to hear out others with counter opinions or knowledge, it makes the more senior members less willing to share what they know.

An old adage about glass houses and stones comes to mind.

P.S. yes, you may add me to your ignore list if you would like. But please, make a big show of it so we all know how you feel. That is typically how members do it.

rockstar143

iTrader: (6)

^^^
That was so well put.

What have I added to this forum? Since you love researching and learning, why don't you take a gander at how many DIY's I've put together and how many questions I answer for other members via PM on a weekly basis?
You're pretty petty for being 53.

What have I added to this thread? Nothing much since you seem to have covered most of the bases on saving gas. Although unlike you, I don't think it was any great revelation and I also think you spouted off a lot of your opinions cloaked as fact.
Use 93, keep it as close to 55 on the highway and make sure your tires are inflated and you'll get decent miles per gallon out of a mediocre output 3 liter + engine. What a fucking revelation.

No go ask someone else to suck your dick, our mouths are full.

No wait...ummm...your mout...
never mind.

emry

I've seen lot of arrogant kiss-ass rude MFs in my life but I can tell that you and that fag Taco are the most pathetic. Anyway, and hopefully never see you again in this tread or any other tread.

good riddance

P.S. this ignore list is a nice feature in this forum that I missed in other car forums. I'm luv'n it.

rockstar143

iTrader: (6)

Name calling? I kept it classy thus far but...
Wow...you're really hitting an all time low.
I'll post where I please.

and trust me, I'll be checking in anywhere you decide to post your pseudo-intellect.

gatrhumpy

iTrader: (1)

You have no idea what I'm talking about. No the MTBF will not be the same for parts, oil, etc. They will be different. The MTBF depends on the inherent reliability of the part, component, or in this case, oil. Unit of measure was 50K miles.

You do realize people think you're an idiot, right?

cu2wagon

I'm not sure if you're aware of this, but it's not really nice to use some terms to describe people in a derogatory manner as such.

Earlier, you implied to know the rules by saying, let me see what you said, ah:

Now, I'm not fully versed in the rules of the site, but I do suspect it's frowned upon to refer to people as you have. In some real world situations, that can actually be considered a hate crime.

I'll also call your attention to the "mommy button" which could be used to report your post and for which the mods/admins may not look too kindly. So, it may actually be you who is not seen any longer on this forum. Hopefully not and we'll all be able to enjoy your stay.

Enjoy your stay!

rockstar143

iTrader: (6)

He's from a time where "people" knew their place though, Joe...
he's gonna learn us today...
we can stand on a lawn, just not his.



What a hateful old and dumb geezer.

gatrhumpy

iTrader: (1)

He's a nice guy, unlike you. He's contributed more than you'll ever know. The only thing you've done was piss off a lot of members with nonsense and narcissism. STFU.

rockstar143

iTrader: (6)

OMG stop helping your troll friends!



but seriously...
I love you Gatr.
Fine, UF is better than UM at football.

nist7

Indeed. Quite informative post sir. Good reading for a lazy saturday afternoon.

And you know what they say.....the best way to get correct information is to post something wrong on the internet!

But good to always see members contribute real/insightful knowledge from their own professional training/experiences.

Coming from a similarly research/data driven world myself...one thing that always comes to my mind when someone claims these things that can dramatically improve MPG (or other metric) I always want to see if there are controlled experiments done to prove this. Lighter foot and cruise control are factually known to cause higher MPG (though people drive usually way too fast for this mostly).

If we had an infinite budge with a large lab, we could test all kinds of hypothesis as listed in the OP.

Such as taking two identical RDXs in everyway, and drive them in the same road/load and have different oil change intervals to see if there is any actual difference. This would be something interesting to undertake if one were to have enough disposable income to do these fun experiments.

gatrhumpy

iTrader: (1)

So now it seems like you're about to get banned.

rockstar143

iTrader: (6)

LOL...I tried to warn him!
I told him to replace the F word with the N word and it would be fine!









you know, Nefarious!

gatrhumpy

iTrader: (1)

gatrhumpy

iTrader: (1)

So, is anyone interested in seeing the equations I used?

thoiboi

I am!

emry

Really? Your sheet shows unit of measure as "hours of operation"for both MBTF and calculated change interval. So again, where did you get the MBTF=50000 for the oil?

Wrong. You are the idiot who doesn't know the difference between hours of operations and miles and comes here telling lies thru your teeth. Have alook at your sheet image again and you'll know.

nist7

What would be more interesting is to also know how/rationale of how these equations came about.

I'm coming from a medical background, and so the risk calculators for certain health conditions are usually built from large population/epidemiological studies that generates a certain curve/distribution and then pulling a "best fit" equation out of that and then apply it to a new patient to calculate certain risks for development or worsening of a disease given their current symptoms/signs.

Would be interesting to know how in the engineering/mechanical parts industry come up with equations and predictors for mechanical parts/fluids/etc..

Another question, which may be off topic, is the debate/battle between OEM and "performance brand" parts. Many swear by OEM as best while others go to lengths to show the superiority of certain aftermarket brands (ie Red Line for ATF, etc.). And it's mostly touted that OEM parts have millions of dollars and many many hours of professional engineers behind them so they must be better....

cu2wagon

I actually caught that back when he posted it and thought the same thing; but units don't matter as long as they are consistent throughout. If he went and changed the labels from "hours" to "miles" you get the same calculations. Assuming there aren't any inter-unitary conversions (H:M:S) that would throw off the miles units. But I don't think there would be judging from the labels

emry

I've had some good experience with after market parts but for the critical ones like MAF or other sensors. Using the tierods or even disk brakes should be fine and I buy them aftermarket to save but won't cheap out of the critical parts.

gatrhumpy

iTrader: (1)

Well, the spreadsheet is geared towards aircraft, not cars. I did not have a stock unit of miles set up when the spreadsheet was created.

emry

OK then why come and use the word "miles" and say "Emry you were wrong"?

Does this make any sense? In your own words using hours and then telling it is miles?

gatrhumpy

iTrader: (1)

I've already explained myself. The spreadsheet is the same spreadsheet that other Reliability and Maintainability experts across the Navy use to determine inspection and repair intervals. THERE IS NO WAY TO ADD MILES TO THE SPREADSHEET UNLESS YOU OWN THE PASSWORD TO THE SHEET. The units are irrelevant, as long as they're consistent.

Get it now?

I could have used lightyears, parsecs, or rack units, as long as I related those units to a standard way of measuring a car's life, which would be miles.

cu2wagon

rockstar143

iTrader: (6)

Yeah, tierods and brakes are definitely not critical parts...but make sure your MAF is changed out regularly!
That is, if you want MPG but don't care so much about dying.

You fucking moron...

emry

But you can't use the same fixed MBTF number for fluids and metals and plastics etc. Each of these material obviously have their own MBTF.
If you use MBTF=50000 for an aircraft part, you can't use the same MBTF when calculating for fluids like oil.

The only way to a get reasonable MBTF for oil is perhaps what manufacturers and oil companies do by testing the molecular properties of a particular oil under certain conditions and decide when to replace the oil.

That's why a reasonable MBTF for a full synth oil is reported to be between 5K and 15K miles. But this range depends directly on the engine condition. For instance in cars with turbo that is sensitive to oil film and the turbo literally cooks the oil in high temperatures, they recommend to change the oil at around 5K-6K miles intervals. Of course changing can be postponed til 15K miles or beyond but the danger is sludge formation which damages the engine compartment.

emry

Critical was referred to the engine performance. You fucking moron

gatrhumpy

iTrader: (1)

I've already said that. But thanks for reinforcing something for me.

rockstar143

iTrader: (6)

Emry,

I can only assume you were let go of whatever career you had...replaced with a young buck knowitall out of college they paid half as much. It's a tough break since you were more qualified and had more experience, presumably.
I can assure you though, that although being a greeter at walmart in your twilight years isn't necessarily as glamorous as you were probably led to believe. You still do serve an important role in society, man.

We do thank you for your service, sir.

rockstar143

iTrader: (6)

But you have no problem buying lesser quality aftermarket parts for those items though, I did read that right, right?

emry

Lesser quality of what? The disk brakes are all cast iron. In fact majority of them are made in China and shipped to distributors with their own packaging and brand names. Some cheaper pads may wear faster or disks may not last as long but I'm not gonna spend a whole lot more on just a brand. I have used Chinese tie rods for many years with good result. But almost every time I bought Chinese MAF, O2, Relays, or other electrical stuff their didn't last long.

rockstar143

iTrader: (6)

I'd stay away from chinese aftermarket axles...those have a tendency to give vibrations.

gatrhumpy

iTrader: (1)

Wow.

thoiboi

TIL:
MPG's >> stopping properly.


Sounds good to me.

gatrhumpy

iTrader: (1)

Majofo

You guys still going on..
I think Mark Twang had some words for this.. something like.. don't be snitching on a snitch cuzz you da snitch cuhhhhh.. ya erd me?!

Anyways.. you guys going on about MTBF, oil, burrrrshiettt... and I'm still trippin on:


kermitdrinkingtea.png

TacoBello

Not gonna lie, when I too first read that, I had a major :homerassgrab: occur over here.

Shiiiiet, even my Canadian engineering degree tells me to not be that much of a cheap fuck.