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]

Originally Posted by 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.

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?

[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]

Originally Posted by rustyballs_69

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]

Originally Posted by rustyballs_69

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]

Originally Posted by CactusWill

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.

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