woodsdesign

After reading all the info on oils I checked into my alternatives. I recently bought the Comp Cams additive and added it to my fresh 10w30 Pensoil oil change. However, I thought that the best idea was to just change the oil with Mobile racing oil to be safe. I discovered that it was only sold as 20w50.
My question is: Am I ok with just adding the Comp Cams additive or is it better to use mobile 20w50? Is 20w50 ok to use?

CaveCreekChump

I purchased a few 4 oz. bottles of ZDDPlus from Corvette Central and added one to my Mobil One oil.

Rather than change over to a different type of oil, I want to continue using synthetic because my '65 overheats once in a while. Also I can choose the viscosity that best suits my driving conditions.

tominohio

I ran 20-50W in my Corvettes since the mid 60's with no problems even in Ohio year round.
I fly aircraft and mix 5 gallons of 110 aviation leaded in every other tank so synthetic oil is out of the question. Synthetic oil can't handle lead very well which is why no total synthetic oils are approved for aviation.
I run Brad Penn Racing 20-50 in my "66" which still has more than enough Zinc in it's blend.
Tom in Ohio

tuxnharley

................STP? I think I remember that it has a very high concentration of Zinc and phosphorous, in addition to the glacial viscosity? Maybe it would help in small doses as long as not enough was used to make the viscosity too high and slow down the return rate to the pan/pump?

Anybody know? Any thoughts?

66L72

acc to NCRS

any oil that has CI4 or CJ4 ranked first in the series of standards that the oil meets(in the circular logo on the can) is fine without additives. why use additives when the correct oil exists everywhere.

Donald #31176

Most auto manufactors discourage the use of additives when performing oil changes and is cause for voiding the warranty. Most ZDDP additives are NOT ASHLESS and long term use can lead to severe coking of the combustion chambers and pistons. Use CI-4 or CJ-4 for stock valve trains. As for the Comp Cam, Isky and Lunati camp perhaps you should contact your respective tech lines and see what they recommend.

Plasticman

As I was told long ago, STP is first, basically a viscosity index improver, with additional "improvements" over the years (meaning that it's main purpose was to thicken and widen the basic viscosity range of any oil that it is added to). If you want a thicker and wider viscosity range oil, then why not buy one in the first place? Also, viscosity index improver additives are one of the first to break down over time/usage.

But I guess I am just being cranky today, since I don't understand why guys keeping asking about the right oil to use in flat tappet engines. What part of "Use only CI-4 or CJ-4 rated oil" don't they understand?

Plasticman

GCD1962

I think he means the STP that is a zddp additive (says so on the bottle), not that old STP stuff that was clear and basically fell to the bottom of the oil pan and stayed there. On a similar point, some one said they added a zddp additive to synthetic oil. I wonder if the two actually mix together or stay suspended ?

Plasticman

Don't see any such animal on the STP website. Just the same old standard STP Oil Treatment, which states: Fights Friction to Help Protect Against Engine Wear by Providing a Thicker Cushion Between Moving Engine Parts

Sounds like a thickener to me.

http://www.stp.com/oil_additives.html

There is also a 4 cylinder Oil Treatment that states: Increased Anti-Wear Protection, but it also says: Specially formulated to fight metal-to-metal friction by providing a thicker cushion between moving parts.

Plasticman

1snake

I agree, I get tired of beating this same old dead horse. I'll continue to use diesel motor oil like I have for years and everyone else can use whatever they want.

Jim

AZDoug

Don't know what the website says, but the bottle of STP I looked at at Pep Boys a few weeks ago said Contains ZDDP.

Doug

Hitch

GCD1962

I don't know what the site says. I have a bottle, blue color, that is a metal protector from STP with the notation that it contains zddp. I bought some at wally-mart last year. Not sure if it's still available as I haven't reectnly looked. I bought over 6 cases of gallons of the old Rotella, so I have a few years before I have to worry about changing to something else.

I just found the bottle in the barn. The description is as you noted above, but it does note that zddp is in it on the front label. On the back zddp is the second of two listed compounds. It cost about $2.50 and if still available is probably just the same as what others sell for up to $10 or more.

dizzydale

Hey Tom,The OLD Kendall,the GREEN stuff.Good enough for The Swamp Rat it's good enough for me .diz