corvette95

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).

C409

..... ZDDP in reasonable amounts likely won't hurt anything ... However , Its use will shorten the life expectancy of your catalytic converter .....

corvette95

In your opinion, keep using Mobile 1 Extended and forget the zddp

odxr

if you have roller lifters I wouldn't worry about it.

C409

..... 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 .....

Tom400CFI

NO. The LT1 (and every 'Vette made after 1986) has roller lifters, which eliminates the area of concern.

-=Jeff=-

Tom400CFI

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"

-=Jeff=-

I know, but you did say every vette after 86

No worries, all good