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Old 08-27-2013, 08:31 PM   #1
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Zinc in my oil

I've been told to use diesel motor oil in my jeep because it is the only kind that still has zinc I could buy a bottle of zinc additive bit that's more expensive. Would running diesel motor oil in my jeep help, hurt, or just to nothing to my jeep?

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Old 08-27-2013, 08:36 PM   #2
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Idk about the diesel oil but there are other options if you want zinc. Isky Cams recommended Brad Penn oil for my dads muscle car because it has a high level of zinc. Idk if a high zinc level is necessary in a jeep though.

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Old 08-27-2013, 08:54 PM   #3
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Quote:
Originally Posted by ErikYJ View Post
I've been told to use diesel motor oil in my jeep because it is the only kind that still has zinc I could buy a bottle of zinc additive bit that's more expensive. Would running diesel motor oil in my jeep help, hurt, or just to nothing to my jeep?
The diesel oil is fine. It's rated for both gasoline and Diesel engines. I run Shell Rotella 15w/40 in my 4.2l. Chevron DELO makes a 30 & a 40 weight which is also high in zinc.

Look at the API symbol on the back of the bottle.

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The C in CJ-4 stands for commercial (diesel) applications and the S in SM stand for service station (gasoline) applications. Basically it's just a heavy duty oil designed to hold up to high stress situations and can be used in both engines.



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This one can only be used in gas engines. If it was used in a diesel you'd eventually have big issues.
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Old 08-27-2013, 09:10 PM   #4
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LOL, I used Rotella in my SV650S, but i currently use whatever is cheapest.

Whats the big deal about Zinc? 90% of the oils out there are backwards comparable to our Jeeps years engines.... and beyond....
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Old 08-27-2013, 09:14 PM   #5
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I just put in 15w-40 tonight... Man, let me tell ya! No valve chatter and no hearing lifters... quiet as can be. A lot of theses forums say that weight of oil is standard in Jeeps over in Australia.
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Old 08-27-2013, 09:15 PM   #6
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I use 15w40 diesel oil in my 87 2.5L... oil pressure at 50 psi
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Old 08-27-2013, 09:36 PM   #7
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I have been reading about this over the last few weeks. There was an article about it in the latest Amsoil newsletter also. According to my online reading the zinc level is important for flat tappet cam engines(like ours). The zinc helps reduce the wear on the cam lobes. I have also read zinc is bad for catalytic converters. That along with modern engines not having flat tappets has lead to the decrease in the amount of zinc in motor oils. The affordable oil I have found to address this is the "diesel oil" and Quaker State Defy. Wal-mart had the Defy in stock on my last trip in 10w-30 and Rotella T5 synthetic blend 10w-30. I am probably going to state using the Defy because it's a little cheaper.

On the other hand, there are lots of Jeeps running around with 200k that probably never had an owner that worried about the type of oil it used let alone changed it at the proper time. I don't know if the zinc level would give the engine an extra 5k or 40k of lifespan. I am not an expert in this by any means. I just found the topic interesting and did a little googling.
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Old 08-27-2013, 10:55 PM   #8
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Just saw the thread and was wondering, will using a lighter weight oil cause it to leak from the filter? I've heard of one person here around my town that it supposedly happened to, I really didn't know how much truth was in it. I've read a lot about people's different opinions on oil and everybody seems to go heavier. I'm asking this because it's getting time for me to change my oil for the first time since I've had the jeep, and having owned nothing but pick up trucks my whole life, I really don't know. And is there a particular oil and filter combo that seems to work good? I've got a 94 with a 2.5.
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Old 08-27-2013, 11:14 PM   #9
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I used a bunch of Castrol with Bosch filters over the years in my 89 2.5. I killed it with almost 300k miles.
Each oil company takes a little bit different approach to their additive packages. Castrol tends to put a little more zinc than the others. Other than that, there is not much difference between 10W and 15W for cold winter starts.
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Old 08-28-2013, 12:12 AM   #10
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Quote:
Originally Posted by 2xs View Post
LOL, I used Rotella in my SV650S, but i currently use whatever is cheapest.

Whats the big deal about Zinc? 90% of the oils out there are backwards comparable to our Jeeps years engines.... and beyond....
I've worked for Shell who also owns the Pennzoil Quaker Sate Company for about 20 years so the Rotella is readily available to me that's really the only reason I chose that brand. And I think the zinc thing is an update(made a while back) for the 258. I wasn't even aware until this was taped to my new engine when I opened the crate......

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Old 08-28-2013, 12:14 AM   #11
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Just saw the thread and was wondering, will using a lighter weight oil cause it to leak from the filter? I've heard of one person here around my town that it supposedly happened to, I really didn't know how much truth was in it. I've read a lot about people's different opinions on oil and everybody seems to go heavier. I'm asking this because it's getting time for me to change my oil for the first time since I've had the jeep, and having owned nothing but pick up trucks my whole life, I really don't know. And is there a particular oil and filter combo that seems to work good? I've got a 94 with a 2.5.
Mileage matters. Whatcha got?
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Old 08-29-2013, 07:22 PM   #12
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mileage matters. Whatcha got?
160,000
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Old 08-29-2013, 08:08 PM   #13
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Quote:
Originally Posted by Mbclark View Post
I've worked for Shell who also owns the Pennzoil Quaker Sate Company for about 20 years so the Rotella is readily available to me that's really the only reason I chose that brand. And I think the zinc thing is an update(made a while back) for the 258. I wasn't even aware until this was taped to my new engine when I opened the crate......

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what was the engine that was taped to ??
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Old 08-29-2013, 10:15 PM   #14
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160,000
Use a high mileage oil in a 10w/30 or 10w/40 depending on temperature. Brand doesn't really matter.
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Old 08-29-2013, 10:16 PM   #15
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what was the engine that was taped to ??
258
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Old 08-29-2013, 10:18 PM   #16
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258
wow..that is interesting
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Old 08-29-2013, 10:22 PM   #17
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wow..that is interesting
Someone else said something about newer metals not having as much zinc? Not sure if that's the reason or not. Didn't really research why a flat tappet can needs zinc I just grabbed a high zinc oil and poured away, figured it couldn't hurt.
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Old 08-29-2013, 10:28 PM   #18
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Someone else said something about newer metals not having as much zinc? Not sure if that's the reason or not. Didn't really research why a flat tappet can needs zinc I just grabbed a high zinc oil and poured away, figured it couldn't hurt.
yeah,it has me thinking too.I just ask the oreilly manager to see if he could get me some 30 weight valvoline racing oil for my near 400 horse 350.that is what I used in hotrod motors for the last 40 years.I might go with the delo myself.used it in diesels for years
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Old 08-30-2013, 12:02 AM   #19
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yeah,it has me thinking too.I just ask the oreilly manager to see if he could get me some 30 weight valvoline racing oil for my near 400 horse 350.that is what I used in hotrod motors for the last 40 years.I might go with the delo myself.used it in diesels for years
You'd be surprised how good the Chevron oils are nowadays. They are actually one of the few oil companies that have the capability to do all the API, SAE & ILSAC testing for oils. Some of the big name oils like Castrol actually send oils to Chevron for testing. The Marine stores always have a good selection of viscosities.

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