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Re: Another oil question....
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Posted by bruce werner on June 11, 2005 at 17:09:27 from (65.144.246.212):
In Reply to: Re: Another oil question.... posted by old on June 11, 2005 at 12:16:58:
Most multi-vis motor oils had a poor and unreliable viscosity improver formula built into them the first several years that HD multi-vis oils were marketed. Most consumers were better served with using a 30 grade oil, not a 15W/40. However, science and the chemical companies have been able to blend very dependable multi-vis additive packages for diesels and HD gas engine oils for quite a few years now. Take an oil like Chevron Delo, or Mobil Delvac. or Shell Rotella in 15W/40, you could run these in a big truck for 20,000 miles and send a used oil sample in for analysis, and what you would find is that the viscosity improvers were still working fine, at 100C or 210F, the oil would still be in the 40 grade range. It would still protect like a 40 grade. Oil will never be metal in a can, to replace worn bearings and crankshafts. But most old tractors should perform very well with 15W/40, with the advantage of easier starting and cranking by far in severe cold winter months. You could expect a 1 1/2 percent savings on fuel consumtion with a multi-vis over a straight grade. Virtually all of the big improvements in motor oils have been in multi-vis products, not straight grades. Most if not all new engine warranties require use of multi-vis oils.
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