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ZDDP and C4 LT5 and LT1

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Old 02-12-2018, 06:43 PM   #1
corvette95
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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).
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Old 02-12-2018, 07:23 PM   #2
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..... ZDDP in reasonable amounts likely won't hurt anything ... However , Its use will shorten the life expectancy of your catalytic converter .....
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Old 02-12-2018, 07:32 PM   #3
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..... 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
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Old 02-12-2018, 08:08 PM   #4
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if you have roller lifters I wouldn't worry about it.
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Old 02-12-2018, 08:09 PM   #5
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..... 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 .....
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Old 02-12-2018, 11:10 PM   #6
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Quote:
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.
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Old 02-13-2018, 09:22 PM   #7
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NO. The LT1 (and every 'Vette made after 1986) has roller lifters, which eliminates the area of concern.
except the LT5. . No rollers there..
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Old 02-14-2018, 11:23 AM   #8
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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 11:23 AM.
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Old 02-14-2018, 11:43 AM   #9
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I know, but you did say every vette after 86

No worries, all good
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Old 02-15-2018, 03:46 PM   #10
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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 03:49 PM.
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