type of engine oil

[vette pilot]

After reading the thread on cam wear and oil additives it got wondering
what then is the best motor oil for old engines. I have a 66 L71 427 that was rebuilt aprx 2000 miles ago. I am using 5/30 oil now, the engine builder
recomends that after the engine is broke in to then run synthetic oil.
What do you guy use? thanks vette pilot

 

[midyearroadster427]

i use straight 40 wt oil in my big block...the stuff they were meant to be filled with when they were new.

 

[JohnZ]

15W40 CI-4 diesel oil (Rotella, Delvac, or whatever's on sale).

 

[paul67]

Given all the hoopla at the NCRS site and elsewhere I will try 15W-40 diesel oil this summer for the zinc content. I accept the view that new oils are deficient in lubricating needs for older engines.

Not an easy decision, but we shall see. I thought the SAE folks knew what they were doing. Perhaps yes for modern engines but perhaps not for the old.

 

[BarryK]

Paul, I've been using the CI-4 oil based on Dukes and John's advice for almost a year now and no problems - other than the oil comsumption and blow-by issues but they were there before the switch anyway.

 

[fastvikingonwheel]

In my 246.000 Miles never-opened 327 300Hp I have also
15-40W Heavy-Duty Diesel type oil.
I took that decision aften being through a lot of forums and talked with a lot of oilsuppliers.
In my old 53' Vincent bike I use 10-40 semi-syntetic oil, but think that modern (cyntetic) oil might give trouble depending on the engine construction.
The hyd.valves was the reason for me NOT taking a (better?) modern synt. oil.

Cheers
Jesper

 

[EZG63Conv]

Rotella-- MG