ZDDP - JeepForum.com
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post #1 of 11 Old 07-11-2020, 07:48 PM Thread Starter
dadsterd
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ZDDP

Maybe opening a can of worms on this one...
Any thoughts about using a ZDDP additive in oil? Does the RPM warrant it? Rebuilding engine and cam is definitely worn. It's a 97, so is it age, age+lack of zinc? Any thoughts?
Thanks in advance for your thoughts.

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post #2 of 11 Old 07-11-2020, 07:57 PM
2jhanna
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I believe some guys use Rotella that want more zinc.
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post #3 of 11 Old 07-11-2020, 08:07 PM
Jo3Gee
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ZDDP

Lol yeah, can of worms. In my experience with rebuilding motors, I use zink break in oil only for break in. After break in, I donít see the benefit to continued use in a standard build. That said, I built my stroker with high compression and no cats, and I use high zink race oil in it (valvoline vr-1).

You will get many other opinions though...
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post #4 of 11 Old 07-11-2020, 09:42 PM
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Currently (subject to future change) most diesel oils have old school levels of ZDDP. Nowadays they came in lighter weights as needed if you are looking for lighter than 15w40 weights.

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post #5 of 11 Old 07-11-2020, 10:09 PM
Jerry Bransford
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Quote:
Originally Posted by dadsterd View Post
Maybe opening a can of worms on this one...
Any thoughts about using a ZDDP additive in oil? Does the RPM warrant it? Rebuilding engine and cam is definitely worn. It's a 97, so is it age, age+lack of zinc? Any thoughts?
Thanks in advance for your thoughts.
Definitely not needed or beneficial on our old low performance and low compression engines. The usual engine oils we use in our engines have enough zinc. Zinc wasn't eliminated from our engine oils, its amount was just reduced enough to not wreck the catalytic converter. That there's still enough zinc remaining is backed up by how reliable and relatively reliable our engines are with no problems with cams, lifters, bearings, etc. Mean time to overhauls are usually never before 250k miles. If our engines weren't being properly protected with the usual Valvoline, Mobil, Castrol, NAPA, etc. engine oils, conventional or synthetic, that would not be the case.

Now if I had a high compression high performance engine with stiff valve springs etc. I'd definitely be running something with extra zinc. But in my 2.5 or 4.0 engines? Nah, it's just not needed or of benefit. The outstanding reliability of our Jeep engines backs that up.
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post #6 of 11 Old 07-11-2020, 10:46 PM
Russ Chung
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I have 420,000 miles on my 2005 TJ. I've always used Mobil 1. Lately, I've been using Mobil 1 High Mileage, which has a bit more ZDDP than the regular or Extended Performance versions of Mobil 1. The compression is a bit low; I think I may need a ring job sometime soon, but no problems with the cam or lifters.

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post #7 of 11 Old 07-12-2020, 04:08 AM
Jonny Jeep
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I don't have the link but I can across a website a while back where the guy had built up data from all the oils he'd been testing and in some cases higher zinc oils had more wear evident.
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post #8 of 11 Old 07-12-2020, 08:39 AM
pwmac
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The ZDDP craze first appeared when it was discovered that the then new API oils greatly reduced the stuff due to degrading the cat converters. Now days oils including diesel oils have very low to no amount of ZDDP. The latest oils have other chemicals to reduce wear and most all will be fine for your motor.
The first oils that had these modern additives were European ones certified to ACEA. Check your oil bottle label. Most versions of Mobil1 are certified to various levels of ACEA that are dependent on how the motor is used.
M1 Advanced Full Synthetic tested out to have high strength for resisting wear.

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post #9 of 11 Old 07-12-2020, 08:55 AM
Jo3Gee
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ZDDP

Quote:
Originally Posted by pwmac View Post
...
M1 Advanced Full Synthetic tested out to have high strength for resisting wear.
Iím a big fan of Mobile 1 full syn (after break in). This is a pic under my valve cover (standard build, not my stroker) after 150k miles using only M1.

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post #10 of 11 Old 07-12-2020, 01:23 PM Thread Starter
dadsterd
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Thanks for all the replies. Yes, I too have been liking Mobil1, but that pic is worth a thousand words!! Looks great. Ok, so I'll try some ZDDP only at break in and no more.
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post #11 of 11 Old 07-12-2020, 02:23 PM
Jerry Bransford
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It looks the same after 200k miles with Valvoline conventional.

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