OMG - My dad was using ARCO Graphite!

[josephp732]

So a question - since my dad is running out of this oil what should he use next? The ARCO oil is rated SE-CC and I imagine that this engine was designed for lead based fuels and must have soft valve seats. Would RP straight 30W be appropriate or RP HPS? I was also thinking of sending a sample of the ARCO oil to the lab.

 

[A_Harman]

It would be interesting to see an analysis on Arco Graphite.
Valvoline VR1 10w30 or Brad Penn 5w30. RP HPS would probably be OK, but pricey.

 

[exranger06]

Originally Posted By: josephp732
So a question - since my dad is running out of this oil what should he use next? The ARCO oil is rated SE-CC and I imagine that this engine was designed for lead based fuels and must have soft valve seats. Would RP straight 30W be appropriate or RP HPS? I was also thinking of sending a sample of the ARCO oil to the lab.

The valve seats are a non-issue. Oil never comes in contact with valve seats. No matter what kind of oil you choose, it won't affect the valve seats. I wouldn't use a straight 30 in an engine operating in cold temps. I would use a 5w30 or 0w-30.