Quote:
Originally Posted by GRX
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.
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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!