USED to be... sae 30 was a very plain oil and low rated... BUT NOW... you can buy hd 30wt oil full of robust additives rated for diesel compression AND for gas spark use. So... with that sae30 hd oil, I no long have an objection to using the HD version with all the great stuff added to the very plain base oil. IRONICALLY, its almost twice as much$$$$$ for it as it is for the 15w-40 oil... of which in my mind is actually a much better base oil than the hd 30w..I want oil that has the cling properties to prevent dry starting that damages cam shafts (GM), the anti piston coking at the ring lands(cummins), the anti friction additives that stop the tappet and cam follower wear(cummins and cat), the modifier that stops the piston scuffing, the high alkali additives that neutralize the the acids, The anti clump additives that stop sludge from forming. All is part of the hd additive package... And then there is... the initial cold flow and starting of the 5w-xx but the high temp protection of the xw-40 oil. But now... for more money$$$$, you can run the hd sae30 and come quit a bit closer, if you take away cold starting and high temperature... again at a higher cost. Saw the hd sae30 in the diesel section of wallyworld... But there's nothing wrong with it. IIRC a quart of it was about same$$ as half of a gallon of the 15w-40. from the department of redundancy department.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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