I put some Shell Rotella 15/40 in my truck last December.Oil pressure was erattic when I started the engine the next day.Saw a chart that showed 15/40 was thicker than 30W at zero degrees.Changed to 10/30 oil last week, pressure came up fast and was steady.The pump has to pull oil thru a screen on start up.No more 15/40 in my truck, cant afford to replace it or drive it much now.Might be interesting to put samples of both oils in the freezer for a while to see how thick they get.I had a jar of 40 oil that I used to stick paper gaskets in place.Cold garage,I stuck a screwdriver into the oil and it stood upright by itself.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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