Duramax Diesels Forum Truck of the Week
  #16  
Old 07-26-2017, 09:22 AM
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Why exactly are zinc and phosporous removed for the low-emisions engines?
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  #17  
Old 07-26-2017, 09:45 AM
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The zinc and phos are lower to reduce the impact on the catalytic converters similar to reduced sulfur in fuel...
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  #18  
Old 07-28-2017, 11:28 PM
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Zddp(zinc and phosphourus) are impact additives. They were added to oils to allow the use of more aggressive cams with flat tappet cams and to allow stamped rockers to live. In the 80's to 90's cat converters were failing at high rates and it was found that the zddp was coating the catylist matrix and leading to the failures. So it was removed from s rated oils to extend the life of the cats. Now that diesels have all kinds of emissions eauipment in the exhaust, the same concerns were now with c rated oils, so they reduced the levels to protect the exhaust emissions equipment.
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  #19  
Old 07-30-2017, 11:30 AM
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I run Cenpeco 15-40 oil cause l have older trucks
Its CI-4 rated so it still has the good stuff in it
the price isnt bad but the shipping makes it pricey
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  #20  
Old 07-31-2017, 11:42 AM
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https://m.youtube.com/watch?v=F-mJti...e_continue=162
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  #21  
Old 07-31-2017, 03:10 PM
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Not everybody is impressed with the new oils.

http://youtu.be/bAdGTsOeQVQ
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  #22  
Old 07-31-2017, 07:14 PM
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I know I'm not the new oil just doesn't seem as thick as the old cj-4 did kinda feels like water or compairble to the feel of gas engine oil when you get it on your fingers
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  #23  
Old 08-01-2017, 10:00 PM
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Quote:
Originally Posted by Robby Avery View Post
I know I'm not the new oil just doesn't seem as thick as the old cj-4 did kinda feels like water or compairble to the feel of gas engine oil when you get it on your fingers
It essentially is gas engine oil with soot suspending additives. Many of the ck-4 oils also meet the sn spec I believe it is which is the latest spark ignition oil rating.
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  #24  
Old 08-02-2017, 05:37 AM
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Quote:
Originally Posted by THEFERMANATOR View Post
It essentially is gas engine oil with soot suspending additives. Many of the ck-4 oils also meet the sn spec I believe it is which is the latest spark ignition oil rating.
Actually, the CK4 oils can never meet the SN spec. SN spec has zinc & phos at <800ppm and CK4 allows <1000ppm so they will never have a dual rated (CK4 & SN) bottle.
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  #25  
Old 08-02-2017, 06:11 AM
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Quote:
Originally Posted by BoiseRob View Post
Actually, the CK4 oils can never meet the SN spec. SN spec has zinc & phos at <800ppm and CK4 allows <1000ppm so they will never have a dual rated (CK4 & SN) bottle.
Based off the info you gave, if the oil has less than 800 ppm it will meet zinc and phos requirements for both SN and CK4 so yes a dual rated oil is possible, Barring any other differences in the specs that would make them mutually exclusive.
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  #26  
Old 08-02-2017, 08:38 AM
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What motor oils are still CJ-4?
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  #27  
Old 08-02-2017, 12:29 PM
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Quote:
Originally Posted by FSUwelder1212 View Post
Based off the info you gave, if the oil has less than 800 ppm it will meet zinc and phos requirements for both SN and CK4 so yes a dual rated oil is possible, Barring any other differences in the specs that would make them mutually exclusive.
But SN's HTHS of 2.5 MAX is out of spec for CK4's HTHS minimum of 3.5...
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  #28  
Old 08-08-2017, 10:54 AM
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Here's some info from Shell...

"Previously, heavy duty engine oil marketers could claim an API gasoline performance standard on their products if they met CJ-4 and the required performance tests for gasoline standards. The recommended viscosity grades for modern gasoline engines are XW-20s and XW-30s. As such, this waiver process is being phased out. Heavy duty engine oils which are XW-30s (and which claim API CK-4 approval) cannot also claim API gasoline standards, unless they meet the current phosphorous requirements/limits. With that said, The new fully synthetic Shell ROTELLA® T6 Multi-Vehicle 5W-30 is one such product that meets the performance requirements of API CK-4 as well as API SN and is formulated with 800 parts per million of phosphorous, which meets the API SN requirements.

While the industry waiver is still currently in existence for heavy duty engine oils that are XW-40’s, this remains in discussion to be addressed by the API in the near future.

However, as a leader in the transport industry, the Shell ROTELLA® brand has made the decision to remove API SN claims, regardless of viscosity, from our other products which do not meet the preferred low-phosphorous chemistry for gasoline engines. It’s also important to note that there is no change in formulation associated with this change. It simply means that Shell ROTELLA® products will no longer claim formal API SN approval for products other than our fully synthetic Shell ROTELLA® T6 Multi-Vehicle 5W-30 on labels, technical data sheets, rotella.com and marketing materials moving forward."

- The Shell Rotella Team
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  #29  
Old 08-09-2017, 07:26 AM
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In addition to the Shell Rotella T6 that meets both CK-4 and SN, I saw this at the store the other day:
IMG_20170804_103416.jpg
It claims to meet CK-4, CJ-4, and SN specs.

I am going to see if I can grab a couple drums of the old-school Delo 400 that was just CJ-4. Might be paranoia, but my built motor needs all the help it can get lol
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  #30  
Old 08-09-2017, 01:21 PM
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DAVe3283, if you had read the post right above yours you would have seen where Shell will not "dual rate" Rotella except for one 5w30 with sulfur & phos <800 ppm.
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