2005-06 Jeep OPDA_CPS_Distributor Failure - Page 369 - JeepForum.com
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post #5521 of 5527 Old 05-22-2017, 06:45 PM
imustbenuts
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Originally Posted by setarubi View Post
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Originally Posted by Bigbob View Post
The Delo is good oil. The reason so many run syn high mileage oil is for the added zinc. The 4.0 is one of the only engines running and I think the last engine sold that uses flat tappets. The newer oils are geared towards emissions and being newer engines have roller tappets the need for zinc is not as great. Less friction with rollers. Everything I have seen dictates added zinc in the 4.0 due to the valve train. Check what the zinc in the delo is. IIRC 10K-11K PPM is the recommendation.
SAE Grade 15W-40
Product Number 222220
SDS Number 17108
Density at 15C, kg/L 0.8806
Viscosity, Kinematic
mm/s at 40C 131
mm/s at 100C 15.7
Viscosity, Cold Crank, C/mPa.s -20/6400
Viscosity, MRV, C/mPa.s -25/26,400
Viscosity Index 126
Flash Point, C(F), minimum > 204(> 399)
Pour Point, C(F) -33(-27)
Sulfated Ash, mass % 1.0
Base Number, mgKOH/g,
ASTM D2896 9.3
Phosphorus, mass % 0.12
Sulfur, mass % 0.32
Zinc, mass % 0.13
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I think it's 1300 which is fine. My 10-11K above is incorrect. It's 1000-1100 PPM that works well.
I would be very surprised if that oil has the higher ZDDP needed. EPA required oil manufactures to reduce it. Your old mobile one has low ZDDP. I use the valvoline ZR1 conventional racing oil for this purpose because I can't get other oil in California with proper ZDDP levels for our engine. I do believe the oil does impact the OPDA gear and CAM gear. My OPDA spun fine, no laughing monkey, but both gears were shot. Had bad lifter and lobe too. Installed high volume oil pump when CAM and lifter were replaced.

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post #5522 of 5527 Old 05-22-2017, 11:10 PM
LRod
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Originally Posted by imustbenuts View Post
I would be very surprised if that oil has the higher ZDDP needed. EPA required oil manufactures to reduce it. Your old mobile one has low ZDDP. I use the valvoline ZR1 conventional racing oil for this purpose because I can't get other oil in California with proper ZDDP levels for our engine. I do believe the oil does impact the OPDA gear and CAM gear. My OPDA spun fine, no laughing monkey, but both gears were shot. Had bad lifter and lobe too. Installed high volume oil pump when CAM and lifter were replaced.
Doesn't the ZDDP clog the Cats???
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post #5523 of 5527 Old 05-22-2017, 11:18 PM
imustbenuts
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Originally Posted by imustbenuts View Post
I would be very surprised if that oil has the higher ZDDP needed. EPA required oil manufactures to reduce it. Your old mobile one has low ZDDP. I use the valvoline ZR1 conventional racing oil for this purpose because I can't get other oil in California with proper ZDDP levels for our engine. I do believe the oil does impact the OPDA gear and CAM gear. My OPDA spun fine, no laughing monkey, but both gears were shot. Had bad lifter and lobe too. Installed high volume oil pump when CAM and lifter were replaced.
Doesn't the ZDDP clog the Cats???
Yes too much ZDDP can clog the cats. That's why auto makers have pushed for the new regulations. I believe the warranty on cats is lifetime. This engine requires higher ZDDP due to the flat tappets. However too much of a good thing is bad. That's why I choose to use the VR1 oil and not an additive.
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post #5524 of 5527 Old 05-22-2017, 11:33 PM
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Originally Posted by imustbenuts View Post
Yes too much ZDDP can clog the cats. That's why auto makers have pushed for the new regulations. I believe the warranty on cats is lifetime. This engine requires higher ZDDP due to the flat tappets. However too much of a good thing is bad. That's why I choose to use the VR1 oil and not an additive.
Nope...
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post #5525 of 5527 Old 05-23-2017, 04:59 AM
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Nope...
8/80
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post #5526 of 5527 Old 05-23-2017, 08:17 AM
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Once upon a time I spent the $$s and bought a case of Brad Penn which has high ZDDP. I honestly thought my jeep ran and sounded worse with it. I really wanted the opposite too so I don't really think confirmation bias in play. Back to whatever 5W-30 is on sale at the parts store when I do a change. And my OPDA was at 155k plus with no symptoms when I finally changed it out for a Crown. Besides the questions regarding the design which apply to all OEM units I think the differences in OPDA performance off the lot all come down to manufacturing tolerances. They just weren't consistently precise enough. Once you get down the road though, things like damage to the cam start coming in to play also.
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post #5527 of 5527 Old 05-23-2017, 08:56 AM
imustbenuts
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Originally Posted by biffgnar View Post
Once upon a time I spent the $$s and bought a case of Brad Penn which has high ZDDP. I honestly thought my jeep ran and sounded worse with it. I really wanted the opposite too so I don't really think confirmation bias in play. Back to whatever 5W-30 is on sale at the parts store when I do a change. And my OPDA was at 155k plus with no symptoms when I finally changed it out for a Crown. Besides the questions regarding the design which apply to all OEM units I think the differences in OPDA performance off the lot all come down to manufacturing tolerances. They just weren't consistently precise enough. Once you get down the road though, things like damage to the cam start coming in to play also.
I'm certainly no expert. Whatever caused my failure at 25k miles sucks arse!
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