Old hotrod flat rapper cam oil

[sloinker]

I also vote for the VR1. I would also shy away from synthetic oils. Seal swelling is a real thing in 1969 era vehicles with rubber parts. Not only do they swell up, they turn to snot.

 

[AMXMIKE1969]

Thank you everyone. I want to use conventional as I'm not sure about synthetic and seals, gaskets etc. It has 66,023 miles on it. Not sure if the cam as it was installed when I got the car. Auction out of Texas.

 

[kschachn]

Today's Group III synthetics are primarily composed of the same molecule types as a conventional oil. The old fears of synthetic causing leaks was from a predominantly Group IV (PAO) synthetic.

What a synthetic gets you these days is a higher viscosity index and better resistance to sludge and deposit formation. All of which are beneficial. There is zero reason to worry that a modern synthetic will cause any issues.

They most certainly don't turn things to "snot".

 

[OVERKILL]

Today's Group III synthetics are primarily composed of the same molecule types as a conventional oil. The old fears of synthetic causing leaks was from a predominantly Group IV (PAO) synthetic.

What a synthetic gets you these days is a higher viscosity index and better resistance to sludge and deposit formation. All of which are beneficial. There is zero reason to worry that a modern synthetic will cause any issues.

They most certainly don't turn things to "snot".

Exactly. And seal compatibility is a standard.

 

[Randy_R]

VR1 conventional.

 

[Randy_R]

Or, Summit sells Penn Grade 1 10W-30 in 5 quart jugs for 36.99. It usually about $10/quart. If u buy 3 u get free shipping. It’s a partial synthetic but that’s a good deal considering your options. Maybe you can buy it off the shelf if you have a local speed shop. It’s the green oil.

 

[ARCOgraphite]

Exactly. And seal compatibility is a standard.

To contemporary engines and materials.

 

[OVERKILL]

To contemporary engines and materials.

They'd be vetted against the same standard as the "Hot Rod" oils, particularly, if they are API certified, which is ASTM D7216:

You'll note nitrile rubber there as well as Ethylene Acrylic and Fluorocarbon.

As somebody who has used modern synthetics in many old engines, this is something that is wildly overblown.

 

[53' Stude]

They'd be vetted against the same standard as the "Hot Rod" oils, particularly, if they are API certified, which is ASTM D7216:
View attachment 230283
View attachment 230284

You'll note nitrile rubber there as well as Ethylene Acrylic and Fluorocarbon.

As somebody who has used modern synthetics in many old engines, this is something that is wildly overblown.

100% truth. Thank You for info and link sir