5w-40 diesel synthetic

[irondiezl3]

ive seen alot of info about using 5w-40 diesel synthetic motor oil especially shell rotella T in cars. alot of reaserch says its not only safe but extremely beneficial and perfectly safe to use. i worked with a mechanic at valvoline who swore by it said hes been doing it for years. whats the deal with that? any opinions? anyone tried it?

[Spilner521]

I don't see why it would hurt anything, but then again, I don't see why it would be beneficial if your Mobil 1, Castrol, etc. synthetic motor oil will do the job just fine.

Diesel oil is designed to be used in engines that see constant RPMs for a long period of time. I'd say if you did a lot of highway driving, it would maybe be better at reducing wear, but I don't know if it would be a measureable difference.

My dad uses it in our family's boat. He did some research and found that it was reccomended to use it because boat engines also see constant RPMs for long periods of time, since there are no gears to shift.

[CactusWill]

It is great for your engine... The downside is that it absolutely destroys your emissions. The whole reason normal oil does not contain the heavy metal additives is for emissions reasons, and once you start using that oil in your car, your catalytic converter will be ruined very quickly.

[rustyballs_69]

It is great for your engine... The downside is that it absolutely destroys your emissions. The whole reason normal oil does not contain the heavy metal additives is for emissions reasons, and once you start using that oil in your car, your catalytic converter will be ruined very quickly.

What the fuck are you smoking? Destroy emissions? How the fuck will the cat be ruined? Explain please. I can run my 3.4l on the same oil I run my Cummins on with no down side. Please tell ne how my catalytic converter will be ruined?

[Redog]

^^ I gotta agree. I don't see the connection

[misslindseysue]

40 weight oil is a little thick - your fuel economy will go down.

[clutch1]

oil being burned means bigger problems... and a thicker oil should sneak past seals to get burned less readily.

[irondiezl3]

mobil1 or royal purpole

[CactusWill]

What the eff are you smoking? Destroy emissions? How the eff will the cat be ruined? Explain please. I can run my 3.4l on the same oil I run my Cummins on with no down side. Please tell ne how my catalytic converter will be ruined?


I don't smoke anything sir. Thats what decades of research done by other people says. And unless you are going to do decades of research yourself, I'm going to believe the research done by other people. Did you think that there could be some magical reason why all oil doesn't contain what diesel oil does?

[rustyballs_69]

All that research still didn't tell me how my cat will be ruined.

[irondiezl3]

o boy what did i start :) hmm 5w-40 isnt really that much thicker is it??

[CBLOHM3400]

and what does 5w-40 run a quart?

[irondiezl3]

$4.75

[CBLOHM3400]

what kind of tempatures do you see in ny (hi's and low's)

[irondiezl3]

i think the lowest this year was 1 degree the highest ive remembered but dont know actual number was mid 90's

[CBLOHM3400]

oh ok i see the 5 part of the oil working for you but the 40 seems alittle thick for my likings on a @ temperature engine
but this is just my opinion

[irondiezl3]

i think im going to switch back to regular 5w-30 synthetic i like the 5w-40 cuz ive heard its amazing at cleaning an engine but alot of people have said that kinda on the thick side so im gunna go back.

[CactusWill]

All that research still didn't tell me how my cat will be ruined.


Do the research yourself then and find out. Heavy metals ruin emissions. End of story.

[Spilner521]

Do the research yourself then and find out. Heavy metals ruin emissions. End of story.
Where in your research does it say that a 4 stroke gasoline burning engine should normally burn it's own engine oil? On a healthy engine, the oil does nothing to emissions or the cat.

[hahano404]

.....

[CactusWill]

Where in your research does it say that a 4 stroke gasoline burning engine should normally burn it's own engine oil? On a healthy engine, the oil does nothing to emissions or the cat.


Its not my research big guy. Its the industry's research. If you guys disagree with them, thats between you and them not me.

[Spilner521]

OK big guy. It's not your research, but you're agreeing with it. If all you're doing is quoting the research, but don't exactly know what research was done or why 'they' came to the conclusions they came to, I guess you don't really know what you're talking about.

[CactusWill]

OK big guy. It's not your research, but you're agreeing with it. If all you're doing is quoting the research, but don't exactly know what research was done or why 'they' came to the conclusions they came to, I guess you don't really know what you're talking about.


And once again, you haven't done the research either, so you don't know any more about it than anyone else. You just want to assume that all the research that has already been done is wrong, without any research of your own to back up your assumptions. Thats real smart.

[Spilner521]

Tell me what research I have to do. I know how an engine works. A healthy running engine doesn't burn it's own oil. If the oil doesn't burn, there's no way for that oil or it's additives to be in the exhaust to ruin the catalytic converter. It's a little common sense and putting 2 and 2 together. It's actually pretty easy to understand.

Also, others have posted, they have personal experience running diesel oil in a gasoline burning engine without ruining anything. I guess they must be lying.

[CactusWill]

Tell me what research I have to do. I know how an engine works. A healthy running engine doesn't burn it's own oil. If the oil doesn't burn, there's no way for that oil or it's additives to be in the exhaust to ruin the catalytic converter. It's a little common sense and putting 2 and 2 together. It's actually pretty easy to understand.

Also, others have posted, they have personal experience running diesel oil in a gasoline burning engine without ruining anything. I guess they must be lying.


The more you talk the younger and dumber I can see that you are.

I can absolutely guarantee you that oil additives make their way through the tailpipes. Just as contaminants from the intake get into the oil and the oil gets dirty.

You might want to have a little more respect and open up your mind to things in this world that you do not yet understand, rather than just be a young hardheaded smartass that thinks he knows everything.

[hahano404]

.....

[Spilner521]

The more you talk the younger and dumber I can see that you are.

I can absolutely guarantee you that oil additives make their way through the tailpipes. Just as contaminants from the intake get into the oil and the oil gets dirty.

You might want to have a little more respect and open up your mind to things in this world that you do not yet understand, rather than just be a young hardheaded smartass that thinks he knows everything.
You got it buddy :thumb: I'm young and dumb, I don't respect anything or anyone and I don't understand cars or engines or know anything at all. Wow! It's almost like you know me...you pegged me perfectly!

[hahano404]

.....

[irondiezl3]

geeze what did i do :/ lol

[Spilner521]

I'm over it :thumb:

[irondiezl3]

good and if its worth anything i took both ur opinions in consideration :):) ahh i want this diesel oil out anyway maybe ill get motivated tomarrow and getrid of it.

[TheMeaningOfLife]

god people. go to advance auto parts right now and get the mobile one filter and 5 quarts of castrol synthetic for 27.99 and call it done, and yes im sure i work there and you save like 20 bucks

[irondiezl3]

how the hell do u get that for that price thats impossible even at walmart the oil is more than thatwithout the filter especially a mobil filter. man i need to move to ur state.

[CactusWill]

AC delco filter is $4 and theres nothing wrong with getting the generic oil no matter what type you want.

[irondiezl3]

i love delco filters 3.64 at my wally not bad.

[irondiezl3]

ok so its nasty cold her in the roc. so im to cheap to buy a remote start :) so i just go out and warm the beast up every morning. well ive noticed for a week wtf is that smell outside. never even thinking about my car. my exhaust never smells. ive pinpointed it to that. now i know this could be all in my head technically but im telling you before i had that diesel oil in no smell whatsoever. also to support that theory is the fact that i have all new 02 sensors, exhaust is still solid and u name it tune up wise its been changed flushed cleaned! idk man im wondering maybe hes right about the oil u never know. im going to post what happens when i go back to penzoil platinum.

[MixtapeMessiah]

autozone has oil and oil filter packages for like 15-30 bucks, sure the oil may suck compared to the royal purple Ive been running for 2 years already but if u aint got lots of money just go that route...just as long as u dont get some POS oil like autozone name brand oil or some crap like that

[MixtapeMessiah]

AC Delco PF46 or PF47 oil filters (depends on engine) are like 4 bucks, aint expensive at all, come on now

[irondiezl3]

you like that royal purple?

[MixtapeMessiah]

hell yea, I wouldnt be using it over and over for the past couple of years if I didnt

If I use any other oil my car runs like shit

[irondiezl3]

so u mean to tell me all the people who say they can feel the difference its really true its not in peoples heads?

[MixtapeMessiah]

yeah Im pretty positive on that one..its a love/hate relationship really, it does everything it says it does but it can get expensive..I usually pay around 50 bucks for 5 quarts...but in the long run I go 5-6k miles on an oil change and I havent had any problems

[irondiezl3]

maybe ill try it next

[MixtapeMessiah]

Theres a saying out there if u switch to synthetic dont go back to conventional oil...like EVER

When u start to use royal purple Id keep using it over and over, dont switch to any other oil

[irondiezl3]

tell you what one thing i do like about rotella t 5-40 synthetic is i have not had lifter tap since its been in the motor. no oil has done that yet.

[mbeals]

Hate to dig up an old thread but......

How are you guys running the rotella T liking it still? I'm getting ready for an oil change and found a gallon of it is cheaper then good dino oil and half the price of mobil 1.

Oh, and the emission controversy. Its zinc. It was added as an anti wear additive. It forms a thin surface film on metal surfaces (similar to moly), forming a barrier between metal surfaces. Its still on the cyl walls when the piston heads down towards bdc and some burns off during combustion. Its the zinc oxides that kill the cat. This is the reason flat tappet cams are no longer used (they wear out without high zinc oils).

As far as I know shell reformulated their diesel oils to be zinc free a while ago when the feds made them.

Oh, and does anyone know of a filter that fits the LD9 that is longer than stock?

[cherrington17]

*delete. pf52 is the longer one for the 3.4L...not LD9

[Lucalare]

AC delco filter is $4 and theres nothing wrong with getting the generic oil no matter what type you want.

Any competent mechanic will tell you otherwise. I would never run generic oil in my engine, nor any engine I was paid to work on. as for synthetic vs conventional, it's a matter of preference. Synthetics does a better job, and lasts longer, however is quite expensive. I personally use Mobil clean 5000 conventional (but don't believe them when they say it'll run 5000 miles, that's garbage), but if your car runs on synthetic do NOT switch it to conventional, that would be a very bad idea.