Oil

[SkylineNXS]

Kind of a stupid question, but what oil do u 350 guys put in ur motors? I dont have a manual to tell me / do u guys use the high performance or high milage? Thanks.....

Brad

[SkylineNXS]

anybody.....??

[68 P.O.S.]

I'm using Royal Purple 20/50.

[cdowns]

for new engines and freash rebuilds i break in with 10-40quaker state then change to mobil one synthetic// old engines i stick with quaker state 10-40 regular oil because going synthetic after an engine has a couple of hundred thousand miles leads to leaks

[chevyboy55]

Valvoline 10-40

[Longhorn Man]

with the lack of zink in all the gassoline oils, I say stick to diesel oils. I run rotella 15/40 in mine.

[connman]

What does zinc have to do with lubricating an engine? First time I've heard of that.

[GREASEMONKEY72]

flat tapped cammed engines need the zinc


and im running havoline 20/50 right now but gona change to something else cause of the zinc


does the kendal oil have good zinc content???
or am i better off with rotella

[6872xtc]

according to 'Chevy High Performance' magazine, only diesel oils and racing oils have the ZDDP, or zinc phosphate additive at a level to sustain a flat tappet cam nowadays. Royal Purple tells me that they do and always will. My 454 just received a complete rebuild due to the cam, the oil, and my own bad luck. 25000 miles and cam knocked chunks off the lifters, they got up into the cylinders, so it's now .020 over and roller cammed. Supposedly you can use GM cam and lifter prelube at every oil change with any oil if ZDDP content of your oil is low. Royal Purple told me that if my engine would of had their oil in it, they would have covered cost of oil related failure. I don't know how true that is, but seems interesting.

[RACINJASON22]

Kind of a stupid question

IMO no question is stupid only some answers are stupid and from what I can see none of the ones you got here were that. I agree with them all. Thiszinc content thing is one we all need to keep an eye on IMO. The are alot of good advice floating around here on the subject just do a seach and you will find some GR8 links on the subject.
As for my answer to the question I run Mobil 1 full syn. in all newwer vehicals. H-D in the bike. RED LINE in any thing of perfomance nature. my .02 RJ22

[GREASEMONKEY72]

so valvoline racing oil has the zinc we need?

and all royal purple oil has it to?

and does the kendal oil have the zinc we need?

[snj8198]

Im going to Royal Purple after I fix the mess Valvoline left me with another wiped flat tappet and lobe in my MkIV block.

[ETsC10]

Rotella 15-30 w/ K&N filter...new engine.

[sjarrett71]

I've alwys used Valvoline in everything I have ever owned and never had a problem. Of course, I don't keep things too long either.

[chevguy7]

10-40 in mine. valvoline, halvoline, or quaker

[manimal]

I have also read that the DIESEL OILs will also be reformulated to remove the ZDDP. Thanks to the EPA. So if you're running dino oils then get the GM cam break in lube everytime you change your oil.
-Lance

[timcos]

I put 5w40 in mine. Change it every 90 days or 3000 miles...whichever comes forst.

[timcos]

Hey....how does one know if they have a flat tappet engine. I have a stock 350...remanned by Jasper. I guess I could ask them.

[glock35ipsc]

Amsoil 5W-30 synthetic in my 02 GMC and the wifes 02 Monte Carlo SS, Amsoil Synthetic Premium 10W-40 in my 68 and 70 Chevys (both are new motors, < 2000 miles each), and Amsoil Interceptor 2-Cycle oil and chaincase oil in the snowmobiles.