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1955 Patrician 352 oil recommendations
#1
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Packman 1955
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Hello all, I am completely tearing down and trying to clean my Patrician 352. There was a lot of sludge and dirt. Engine has around 38,000 miles and appears to be original shape. I am disassembling the hydraulic lifters and trying to get any and all old sludge or oil deposits out. I have been trying to research correct oil replacement for the straight 20W per manual. I live in central PA and car will be started from time to time in the winter to circulate fluids. I was wondering if a synthetic 5w20 would be too low of a viscosity oil to use. I am planning on changing to the Mellon oil pump as well, unless I would lose important vacuum features as the wipers or anything drastic. I am also replacing new seals and figured a synthetic would be fine then. Was thinking of Valvoline or Castrol. Thanks for anyone's input or expertise on this. I wanted to figure out what to use so I can fill the lifters before re-assembly.

Posted on: 2023/10/8 20:31
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Re: 1955 Patrician 352 oil recommendations
#2
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Kevin
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I did some searching on this forum a couple years ago to determine the best oil for my 1955 Caribbean 352, and recommendation from Jack Vines at that time was to get 20w50. I ended up getting the NAPA High Mileage version of 20w50 and it's worked great so far.

Here is the original thread discussion:packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=8555

Posted on: 2023/10/8 22:02
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Re: 1955 Patrician 352 oil recommendations
#3
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humanpotatohybrid
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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.

Posted on: 2023/10/8 22:21
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Re: 1955 Patrician 352 oil recommendations
#4
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Packman 1955
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Thanks for your advice. I may go with the 10-30 then. Do you see any reason not to run synthetic? I figure the new seals should be ok and I cleaned out all the old sludge.

Posted on: 2023/10/9 20:47
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