ZDDP and C4 LT5 and LT1 - CorvetteForum - Chevrolet Corvette Forum Discussion

Notices
C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

ZDDP and C4 LT5 and LT1

Old 02-12-2018, 05:43 PM
  #1  
corvette95
CF Senior Member
Thread Starter
 
Member Since: Jul 1999
Location: Priceville, AL AL
Posts: 2,372
Thanked 13 Times in 13 Posts
Default ZDDP and C4 LT5 and LT1

I know this is a can of worms. I researched it. I know the LT5 needs inc, Mobil One Full synthetic extended protection (15k) has 900 ppm- one of the highest over the counter. That was is used in my ZR1, does my LT1 running the same 5w30 Mobile One Extended performance benefit from adding some ZDDP additive? Don't want to start a war, just a few facts would be greatly appreciated!
Thanks in advance!

(Side note- fill plus proper size for ZF-6 if anyone knows off the top of your head).
corvette95 is offline  
Old 02-12-2018, 06:23 PM
  #2  
C409
CF Senior Member
 
C409's Avatar
 
Member Since: Feb 2005
Location: Clearwater Florida
Posts: 4,631
Thanked 106 Times in 102 Posts
Default

..... ZDDP in reasonable amounts likely won't hurt anything ... However , Its use will shorten the life expectancy of your catalytic converter .....
C409 is offline  
The Following User Says Thank You to C409 For This Useful Post:
corvette95 (02-13-2018)
Old 02-12-2018, 06:32 PM
  #3  
corvette95
CF Senior Member
Thread Starter
 
Member Since: Jul 1999
Location: Priceville, AL AL
Posts: 2,372
Thanked 13 Times in 13 Posts
Default

Originally Posted by C409 View Post
..... ZDDP in reasonable amounts likely won't hurt anything ... However , Its use will shorten the life expectancy of your catalytic converter .....
In your opinion, keep using Mobile 1 Extended and forget the zddp
corvette95 is offline  
Old 02-12-2018, 07:08 PM
  #4  
odxr
CF Senior Member
 
odxr's Avatar
 
Member Since: Jul 2015
Location: Modesto Ca
Posts: 301
Thanks: 0
Thanked 15 Times in 15 Posts
Default

if you have roller lifters I wouldn't worry about it.
odxr is offline  
The Following User Says Thank You to odxr For This Useful Post:
corvette95 (02-13-2018)
Old 02-12-2018, 07:09 PM
  #5  
C409
CF Senior Member
 
C409's Avatar
 
Member Since: Feb 2005
Location: Clearwater Florida
Posts: 4,631
Thanked 106 Times in 102 Posts
Default

..... If you are in an area prone to emissions testing , you might consider using the regular silver cap version of Mob 1 synthetic (I have no idea how much ZDDP is in there) ... and forget additives ... ZDDP is more useful to engines that have flat (non-roller) lifters .....
C409 is offline  
The Following User Says Thank You to C409 For This Useful Post:
corvette95 (02-13-2018)
Old 02-12-2018, 10:10 PM
  #6  
Tom400CFI
CF Senior Member
 
Tom400CFI's Avatar
 
Member Since: Aug 2004
Location: Park City Utah
Posts: 13,368
Thanked 546 Times in 485 Posts
Default

Originally Posted by corvette95 View Post
I know this is a can of worms. I researched it. I know the LT5 needs inc, Mobil One Full synthetic extended protection (15k) has 900 ppm- one of the highest over the counter. That was is used in my ZR1, does my LT1 running the same 5w30 Mobile One Extended performance benefit from adding some ZDDP additive?
NO. The LT1 (and every 'Vette made after 1986) has roller lifters, which eliminates the area of concern.
Tom400CFI is online now  
The Following User Says Thank You to Tom400CFI For This Useful Post:
corvette95 (02-13-2018)
Old 02-13-2018, 08:22 PM
  #7  
-=Jeff=-
CF Senior Member
 
-=Jeff=-'s Avatar
 
Member Since: Mar 1999
Location: Bartlett Illinois
Posts: 11,899
Thanked 88 Times in 84 Posts
Default

Originally Posted by Tom400CFI View Post
NO. The LT1 (and every 'Vette made after 1986) has roller lifters, which eliminates the area of concern.
except the LT5. . No rollers there..
-=Jeff=- is offline  
Old 02-14-2018, 10:23 AM
  #8  
Tom400CFI
CF Senior Member
 
Tom400CFI's Avatar
 
Member Since: Aug 2004
Location: Park City Utah
Posts: 13,368
Thanked 546 Times in 485 Posts
Default

Originally Posted by -=Jeff=- View Post

except the LT5. . No rollers there..
Yes, I know that. Notice that I said "LT1"

OP already acknowledged the LT5's different oil requirements, so that was already covered. OP was asking about his LT1...which has roller lifters.


EDIT: I guess I should have said "every PUSHROD 'Vette after '86"

Last edited by Tom400CFI; 02-14-2018 at 10:23 AM.
Tom400CFI is online now  
Old 02-14-2018, 10:43 AM
  #9  
-=Jeff=-
CF Senior Member
 
-=Jeff=-'s Avatar
 
Member Since: Mar 1999
Location: Bartlett Illinois
Posts: 11,899
Thanked 88 Times in 84 Posts
Default

I know, but you did say every vette after 86

No worries, all good
-=Jeff=- is offline  
Old 02-15-2018, 02:46 PM
  #10  
ihatebarkingdogs
CF Senior Member
 
Member Since: Nov 2016
Location: Torrance CA
Posts: 1,203
Thanked 204 Times in 191 Posts
Default

OHC engines run at 1:1 spring to lifter loading. So the actual pressure on a given area of cam lobe is lower than in a push-rod engine with 1.5:1 rocker ratios. And 4-valve engines generally use smaller, lighter valves so less spring tension is required. So while an LT5 is a sliding surface valve train, the forces n the lobes and followers is less than in a LT1.

Last edited by ihatebarkingdogs; 02-15-2018 at 02:49 PM.
ihatebarkingdogs is offline  


Thread Tools
Search this Thread
Quick Reply: ZDDP and C4 LT5 and LT1


Sponsored Ads
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: