Hi! I'm about to change oil in the engine of my nailhead 364 on my Buick -57. Thinking about Valvoline racing VR1 20w-50? Do you recomend that? Thanks, Christine.
Pennzoil Pure Plus. Only oil that's 100% man made and has no impurities and flow rates are incredible. Various shootout competitions constantly show this oil at the top. Can be had at Wal-Mart for $25/5 quarts. On my rebuilt 364 I use 10w-30 like stock and add a container of Zddplus to maintain proper zinc levels.
A heavy weight oil such as 20w-50 is not necessary unless you are in a hot climate, or you have low oil pressure due to worn bearings. Valvoline also offers a 10w-30 and 10w-40 in their VR1 blend, these would likely be a better choice for you. An oil optimized for old cars such as Joe Gibbs brand is another excellent choice. But any quality oil is likely to be fine in a 364 since they have a lightweight valvetrain, low spring pressures, and are not revved to 6000+ rpm. An oil or additive wich contains ZDDP will help protect the cam and lifters.
Actually processed from natural gas. and is really good oil but I'm with Walt on this one - any quality oil will do. Check out these websites for info - https://www.pennzoil.com/en_us/education/power-pennzoil-synthetics/pureplustechnology.html and https://pqia.org/
