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D15 oil pressure
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Dave (Mid-MI) View Drop Down
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Joined: 12 Sep 2009
Location: Hemlock, MI
Points: 568 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave (Mid-MI) Quote  Post ReplyReply Direct Link To This Post Topic: D15 oil pressure
    Posted: 12 hours 38 minutes ago at 8:41pm
My Series I D-15 has good oil pressure on startup but lower pressure once warmed up. When warm, the engine must be run 1/3 to 1/2 throttle to maintain pressure in the normal range on the gauge. I switched from SAE 30 oil to 15W-40 but saw no difference. Is this an indication of worn main or rod bearings? Cam bearings?
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IBWD MIke View Drop Down
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Joined: 08 Apr 2012
Location: Newton Ia.
Points: 4091 		Post Options Post Options   Thanks (0) Thanks(0)   Quote IBWD MIke Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 49 minutes ago at 6:30am
The quickest, easiest way to help that is to add a quart of Lucas oil conditioner. Obviously this doesn't fix the problem but does help the pressure. Cam bearings are probably the issue.
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