Engine Oil

I have used Chevron Delo 400, a 15w40 diesel oil in my 3 'A's and my motorcycle for years.

I think that a zinc additive is important because of the flat tappets.
 
I use 15-40 or 20-50 when its on sale at WALMART and change it after 1,000 miles-no filter.I dont bother with a zinc additive as the rpms & valve spring pressures are low on an A.
 
There is so much discussion about this subject for sure. We had a discussion at our last club meeting that went for quite a while. Some run racing oil, some synthetics at $$$$ a quart, some diesel oils, etc. Fact is zinc is being reduced in everything. Personally, as columbiA said, I run Valvoline on sale. I do, however, have a filter and add ZDDP. I think better safe than sorry.
 
You can talk about this oil and that oil forever. The facts are, that most all engine oils today are derived from a paraffinic base crude oil. There are two types of crude oil, Paraffinic and Naphthenic. Most lurication engineers specify and use the Paraffinic based oils. The paraffinic is recognized for it's ability to resist thinning and thickening with temperature, as well as it's lubricating properties and resistance to oxidation, which is sludge froming tendencies. All of the oils mentioned by the members here are very good, modern lubricants.
 
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