WHAT KIND OF OIL?

[WINGMAN]

 My Daytonas 440 is stock with 35K on it, I just drive to shows and work now and then, not hard on it What is a good engine oil to use?   JR.

[The Ghoul]

I swear by amsoil. I run it in every thing I own.
Just dont go to thin or else youll find more leaks then you ever imagined. 

[Johnny SixPack]

I use Castrol GTX 20/W50 in both my "70 440 6-pack and my "69 383 4-bbl.

Good oil pressure and no oil consumption to speak of.

Used it based on Ron's (firefighter3931) recommendation.

[Chryco Psycho]

I use 5w-50 Castrol Syntec

[Ghoste]

Plain old Valvoline 10/30 dino flavour with GM EOS additive for a little zinc.

[Just 6T9 CHGR]

15w-40 Rotella T for flat tappet cams is what was recommended to me......but you know what they say about a$$holes & opinions.....

[firefighter3931]

Castrol gtx 20-50, valvoline racing 20-50, shell rotella 15-40 are all good oils. These brands all have anti scuff additives that the newer "passenger car" lightweight formulations are short of, namely zinc and phosphorus.

Ron

[y3chargerrt]

Neil, How does a flat tappet cam hold up with the  5w-50 Castrol Syntec oil?

[WINGMAN]

   Thanks for all your input guys   JR

[Chryco Psycho]

Neil, How does a flat tappet cam hold up with the  5w-50 Castrol Syntec oil?

to date no problems ,it has high  shear strength & stays pourable in cold climate like where I live 

[y3chargerrt]

Thanks Neil..It gets cold in canada??

[Rubberduck]

Here I found something very interesting. Though it´s pretty much reading.

http://www.boss302.com/oil.htm

Mario

[John_Kunkel]

Any gas engine oil with 30 in the viscosity (0-30, 5-30, 10-30) lacks the high pressure additives needed for flat tappets and should be avoided.

[Ghoste]

I think it applies over a greater range than that John.  There are precious few of the passenger car engine oils today with the required additives.

[Shakey]

Any gas engine oil with 30 in the viscosity (0-30, 5-30, 10-30) lacks the high pressure additives needed for flat tappets and should be avoided.

So...what do you suggest John?

[Ghoste]

This debate has come up here before a number of times and IIRC the general consensus has been this;
That any oil with the little sun symbol on it and something to the effect of "for gasoline engines", is likely missing the additives.
That the additives were removed because all modern engines use roller lifters.
That the GM EOS adds zinc which is the big one that has been removed.
That the zinc is really only crucial during cam break in.
I might be wrong about any or all of that but what I can say with certainty is this, I run what I stated above.  10w30 with EOS.  It's dinosaur not synthetic and it has been what I've used for some time now.  I have had my intake off a number of times within the last 5 years and my cam and lifters still look good, so it has worked for me.

[John_Kunkel]

Any gas engine oil with 30 in the viscosity (0-30, 5-30, 10-30) lacks the high pressure additives needed for flat tappets and should be avoided.

So...what do you suggest John?

Diesel oil, any with a "C" in the rating. (Combustion engine)

Zinc and phosphorus are anti-scuff compounds that are needed when iron parts (cam/lifter) mate with no bearing material.