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Unread 06-25-2013, 08:50 PM   #1
96SUNNY
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Emergency: Oil replaced with diesel oil

Oil pressure SENDER leaked, had to emergency fill with diesel oil 15W-40 APICJ-4/SM

Am I good to go or do I flush and fill with reg 10W30??

why??

most what i read, its ok to leave in for now.. change at 3k ????

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Unread 06-25-2013, 09:17 PM   #2
leftfield6
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Was it a quart to top off, or was it a complete oil change? If just a quart or so, I would say no problem. If it's a full 5+ quarts, it supposedly may damage your catalytic converter, or at least that's what I heard long ago.
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Unread 06-25-2013, 09:43 PM   #3
zander21510
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Its a pretty thick cold weight, but not by much. You don't need to do anything drastic though, I run diesel oil all the time (Rotella T6 full synthetic 5w40) because it stops some ticking noises, has lots of detergents, and works well. It's basically the same as gasoline oil plus more detergents for all the soot created by diesel.

I'd say you're good.
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Unread 06-25-2013, 09:51 PM   #4
dnuccio
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probably fine. my dad had a 63 corvette that started to get a rod knock, so he filled it with diesel oil to quiet it up. ran like that for a while before he sold it
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Unread 06-25-2013, 09:52 PM   #5
Virmagicus
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Oil will be fine. How old is the filter though?
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Unread 06-25-2013, 09:57 PM   #6
96SUNNY
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1 gal

Thanks.....

I filled with 1 gal diesel oil.
Its been running (20 days) very well.
Oil pressure looks great.
does the 4/sm imply that it can also be used for gas engines??

I also read this..
"...it supposedly may damage your catalytic converter"

Can someone be a bit more clear..
how long before signs of damage??
what kind of damage?
what causes the damage.. high zinc??
Is this true or a myth?????
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Unread 06-25-2013, 10:02 PM   #7
5-90
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Quote:
Originally Posted by 96SUNNY View Post
Oil pressure SENDER leaked, had to emergency fill with diesel oil 15W-40 APICJ-4/SM

Am I good to go or do I flush and fill with reg 10W30??

why??

most what i read, its ok to leave in for now.. change at 3k ????
1) See that "SM"? That's a gasoline engine spec.
2) The primary difference between a Diesel-rated oil and a gasoline-rated oil is the extra antiscuff additives and acid neutralizers (Diesels tend to form sulphuric acid in the oil, and still don't run roller valvetrains.)

The idea that a Diesel-spec oil will "poison" your catalyst bed is true - if you have excessive leakage past the oil control rings, or leaking valve guide seals. If you don't lose oil, she'll be right.

(The "poison" for the catalyst is the organometallic antiscuff additives - which is why the newer "Energy Saving" oils aren't really, they're just reduced-om additive oils to reduce catalyst poisoning. However, those oils are intended to be used ONLY with roller-tappet engines, and you will wipe out the cam in a flat-tappet engine, sooner or later. If you see "Energy Saving" on the front, flip it over and look at the back and you will likely NOT see a "C" service rating, which is a Diesel service rating.)

And, using a Diesel-spec oil in the short term in a gasoline engine should cause no trouble - tribological specs and additive packages for Diesels usually far exceed those for gasoline engines anyhow.
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Unread 06-25-2013, 10:04 PM   #8
96SUNNY
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Oil filter is new

i HAD JUST CHANGED OIL & FILTER... SO FILTER IS NEW.

WHY?

LOOKING FOR INFO ON catalytic converter IMPACT

106 DEG WEATHER HERE.. VEHICLE HAS DAILY LONG IDLE TIME (HOURS)
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Unread 06-25-2013, 10:08 PM   #9
zander21510
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Quote:
Originally Posted by 96SUNNY View Post
i HAD JUST CHANGED OIL & FILTER... SO FILTER IS NEW.

WHY?

LOOKING FOR INFO ON catalytic converter IMPACT

106 DEG WEATHER HERE.. VEHICLE HAS DAILY LONG IDLE TIME (HOURS)
I'm guessing the caps means you're yelling, so first let me say: Relax.

You will be fine. Filter is new, oil is new, topped off with diesel oil. I've run pure diesel oil for over a year now and my cat is fine. 5-90 gave some pretty detailed info on impact/differences.

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Unread 06-25-2013, 11:00 PM   #10
SLOspeed
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You're fine. I ONLY use diesel oil in mine. It's a fantastic, high-quality oil that also happens to be fairly cheap. What's not to like?
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Unread 06-26-2013, 12:08 AM   #11
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If it worries you, just change it and get it over with. We're not talking about $1000 here....it's a freaking oil change..so...how much...$35, tops?
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Unread 06-26-2013, 12:53 AM   #12
MasterOne
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The theory that the higher ZDDP found in HDEO is just a theory, and has not been proven to damage catalytic converters. If you really want to know, head over to Bob is the Oil Guy. You don't need the extra ZDDP found in HDEO since your engine doesn't have flat tappets, but it certainly isn't going to hurt anything -- and some people run HDEO because they feel that the extra ZDDP gives them peace of mind. Imagine how much poisoning has already occurred to the catalyst through normal driving.
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Unread 06-27-2013, 09:18 AM   #13
SLOspeed
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Umm... It DOES have flat tappets (the bottom of the lifters are flat). But due to the low rpms and soft valve springs of this motor, the extra ZDDP isn't needed IMO.
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Unread 06-27-2013, 10:14 AM   #14
tucsonzj
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well hmm...maybe i'll be doing diesel oil on my next change? good topic lol
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Unread 06-27-2013, 10:45 AM   #15
MasterOne
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Quote:
Originally Posted by SLOspeed View Post
Umm... It DOES have flat tappets (the bottom of the lifters are flat). But due to the low rpms and soft valve springs of this motor, the extra ZDDP isn't needed IMO.
The AMC 4.0 does have flat tappets, but I was referencing to the Mopar Magnum engines which use hydraulic roller cams. For a little extra protection, I have used BG MOA with good results.
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