Flivver guy Posted September 29, 2022 Share Posted September 29, 2022 I have revived a 1928 Packard 526 6 cylinder car this year. She has been running great. These last few cold mornings I’ve noticed a slight engine knock at start up. It seems to go away as the oil pressure builds. I am running straight 30 wt oil. Is this as simple as change the oil for 10/30? Or am I looking at some engine work. Thanks, Gary Link to comment Share on other sites More sharing options...
edinmass Posted September 29, 2022 Share Posted September 29, 2022 Wrist pin. Let it warm up fully. It will be fine. 2 Link to comment Share on other sites More sharing options...
edinmass Posted September 29, 2022 Share Posted September 29, 2022 If you want to know how to figure out which one, PM me. 1 Link to comment Share on other sites More sharing options...
hidden_hunter Posted September 30, 2022 Share Posted September 30, 2022 13 hours ago, edinmass said: If you want to know how to figure out which one, PM me. While I figure it could be a trap… how do you tell? Link to comment Share on other sites More sharing options...
Flivver guy Posted September 30, 2022 Author Share Posted September 30, 2022 Short out each cylinder individually and see when the knock stops. 1 Link to comment Share on other sites More sharing options...
Highlander160 Posted September 30, 2022 Share Posted September 30, 2022 Why only 30? These old glorified "farm implements" need a heavier shield of oil. Modern engines run 5W 30, modern engines have tight clearances, these old girls have big ones because of how things expand. Step up to 10W 40, you won't hurt a thing. 30 was for very cold climates. If in doubt consult a service manual. I run 50 in old engines with miles on em. No issues, full stop. Well only 1 issue, the oil pressure builds quicker and stays on hot days. Your results may vary, tax n title extra, void where prohibited, see your retailer for details, no purchase necessary...😉 Link to comment Share on other sites More sharing options...
hidden_hunter Posted October 1, 2022 Share Posted October 1, 2022 4 hours ago, Highlander160 said: Modern engines run 5W 30, modern engines have tight clearances, these old girls have big ones because of how things expand. Step up to 10W 40, you won't hurt a thing. I run Penrite Shelsley medium in the Cadillac which is something like 25-70 They have a light as well which is 20-60 Their heavy is 40-70 which would be for pretty specific applications I would have thought (they recommend it for sleeve valve engines for instance) Also has extra zinc added 2 Link to comment Share on other sites More sharing options...
Larry Schramm Posted October 3, 2022 Share Posted October 3, 2022 IMO, diagnose and fix the problem, not mask it. Link to comment Share on other sites More sharing options...
John_Mereness Posted October 3, 2022 Share Posted October 3, 2022 Stop running 30w - try a 40 or 50 straight. Link to comment Share on other sites More sharing options...
edinmass Posted October 3, 2022 Share Posted October 3, 2022 Oil weight will NOT affect the wrist pin noise…….. 1 Link to comment Share on other sites More sharing options...
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