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Old 07-15-2015, 03:29 PM   #5
oldtrux
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Join Date: Jul 2010
Location: Bancroft, ontario
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Re: Which grade oil should I use for my motor?

Quote:
Originally Posted by GRX View Post
The one constant with oil threads is there is no constant. Opinions will vary widely. That said, I run Rotella 15w40 with a bit of Lucas zinc additive in my '69 250. Starts right up at 5 below and 105 above.
15w40 is diesel oil,i would think it would take a while to get to the top end!i would think the factory called for 10w30,just my 2 cents worth though!
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