zddp additive

[95Escahoe]

Don't. You've got some researching to do if you think adding any additives to engine oil could be beneficial.

I did, that's why I am asking, from what I read it says that the 350 TBI motors could benefit from using a zddp additive cause it would bring the zinc level up to what it needs, cause it is not as high in the oils now, a few people on here have used it too

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[SkyHighColorado]

The ONLY reason I no longer use zddp is because of my new Cat. If I ever go catless again I'll be using zddp. But I guess I have some reading to do since my engine is still running great don't I?

 

[bluex]

Extra zddp is really only needed for flat tappet cam engines. Most engines in these trucks have a roller cam so the zinc content isn't as critical for them....

 

[1997k1500Calvin]

I use mobile 1 5w_30... Seems to run great with it..my old tbi since the day it was new always had 10w-30 Valvoline and that motor was perfect..got rid of it with 190k miles never smoked or burned oil

Tapatapatalk

 

[aarolar]

Extra zddp is really only needed for flat tappet cam engines. Most engines in these trucks have a roller cam so the zinc content isn't as critical for them....

I was under the assumption that everything pre vortec was a flat tappet?

 

[bluex]

I was under the assumption that everything pre vortec was a flat tappet?

No some tbi engines got roller cams. I couldn't tell ya an exact year for the change over though...

 

[FastOrange]

No some tbi engines got roller cams. I couldn't tell ya an exact year for the change over though...

Most, if not all, TBI 305/350's had flat tappet's.

4.3L's got Roller Cam in 1993 when GM started using CPI long blocks.

 

[TylerZ281500]

i use brad penn with zinc additive

 

[SkyHighColorado]

^^^ that is a great oil. And I'm willing to bet you won't find a pre '95 gmt400 that doesn't have flat tappet cams. Zinc is needed for more than just cams though. Premature bearing failures have been linked to lack of zinc.

 

[thunderstruck]

Great read here: http://www.chevelles.com/forums/showthread.php?t=443674

First post discusses zinc in oils, end of second post shows how often extra additives REDUCE the wear protection of oils.

The ONLY reason I no longer use zddp is because of my new Cat. If I ever go catless again I'll be using zddp. But I guess I have some reading to do since my engine is still running great don't I?

I didn't say anything about these additives causing major damage to your engine, they just damage your wallet more than anything.