what weight oil do you use in your big blocks? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-13-2008, 04:54 PM
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what weight oil do you use in your big blocks?

Hi,
I was just wondering what weight oil do you use in your big blocks?

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Old 03-13-2008, 05:29 PM
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I`m located in the deep south so I normaly run 15-50wt Mobil 1...
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Old 03-13-2008, 06:44 PM
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10-40w of whatever's cheapest.
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Old 03-13-2008, 07:38 PM
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10-30 in socal. Perfect pressure; 20 psi at hot idle, bypass at 80, 45-55 psi on the highway. Stock bearing clearances on a 10/10 crank
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Old 03-17-2008, 10:28 AM
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i was running 20-50 and that seemed a little too thick so I went to 10-30 to try. IS that going to be too thin? right now its snowing but in the summer it get to about 90 degrees around here. The bearings I beleve are .10
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Old 03-17-2008, 10:34 AM
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i dont have a big block but i say use 10w40 all year.
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Old 03-17-2008, 11:05 AM
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10w-30 is my choice for daily use in the summer and slightly colder fall and spring. For break in I used Rotella SAE 30 if you have a flat tappet cam you may want to consider using an additive because BBC's are notoriously hard on cams because of the different angles of lifters, pushrods, valves, etc.
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Old 03-17-2008, 11:20 AM
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I've own big blocks continually from 1984, from Washington state to California in all types of weather and road conditions. I run 10-40wt oil in all of them! ...Still do.
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