View single post by pbahr
 Posted: 09-28-2008 09:49 pm
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pbahr



Joined: 04-15-2005
Location: Phoenixville, Pennsylvania USA
Posts: 202
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 When YELODOG engine was being run-in, I used Valvoline 40wt.  After 500 or so miles, I switched to Valvoline VR-1 20W-50 Racing Oil.  The VR-1 oil container states that it contains ZDDP.  Not sure all racing oils contain ZDDP.

If you want synthentic (and I see no reason to use it), Castrol, in February 2008, released a new formula Syntec in 20W50 which is labeled "For Classic Cars" and contains the necessary amount of ZDDP.

In addition, oils intended for diesel engines (which don’t have catalytic converters and require ZDDP to minimize gudgeon-pin wear) in the same weights, such as Castrol Syntec Blend Truck 15W-40, Mobil Delvac, or Shell Rotella are also recommended.  I used Rotella in a recent rebuild of a Dodge Neon DOHC engine, and after 700 miles changed to Valvoline synthetic - this engine does not require ZDDP.

My recommendation is thus:
  • New engine run-in - Shell Rotella or similiar diesel oil.
  • After run-in - Valvoline VR-1, or continue to use Rotella.
  • Don't use synthetic oils - the 907 was not designed for it.
  • Don't screw around with any additives - Dale is correct.
  • If you use oils other than those I've noted above, check the oil container or the manufacturers website to confirm that they contain ZDDP.
Pete