Posted by jdemaris on March 28, 2010 at 14:57:25 from (67.142.130.18):
In Reply to: non-detergent oil posted by H. J. Childress on March 28, 2010 at 13:31:06:
The choice of detergent versus non-degergent isn't going to matter unless the engine is heavily sludged up inside and has never been run with degergent oil. I'd be more concerned about viscosity and would NOT use any mulit-visc oils like 10W-30 or 10W-30. The engine is not going to have tight tolerances like newer engines and won't have great sealing either. In fact, some parts of the Model A have NO seals at all. That's why the trans calls for what Ford referred to as "700 W" oil.
If you're unsure, stick with straight 30W. Get an off-road and/or diesel type oil since on-the-road oils don't have the ZDDP lube protection anymore for older engines.
If you really want degergent, try a mix of 50-50 and see how fast it gets black. If it gets bad looking real fast, I'd remove it and stick with the ND oil.
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