Re: 1955 Patrician 352 oil recommendations

Posted by humanpotatohybrid On 2023/10/8 22:21:08

In 1956 Packard recommended 10W30 as an alternative to the 20 weight oil. 10W30, 15W40, and 20W50 are variously used. If the engine is in tolerance I would personally just use 10W30 especially because you want to run it in winter, but if the engine has significant wear then maybe up it.

I have a 55 400 and did not notice a difference in oil pressure between 10W30 and 15W40, but my engine just had valves machined and rings replaced. Supposedly about 40k miles since new in mine currently.