Posted by farmersamm on November 09, 2018 at 12:31:01 from (206.246.18.143):
In Reply to: Shell vs. Mobil posted by Russ from MN on November 09, 2018 at 05:52:19:
Lot of it depends on the condition of the engine.
An engine in good condition, with little blowby, will do well on good oil. And you should use good oil to help keep it in good condition. Either brand is good. Depends on what color bottle you find attractive.
When the engine starts to go bad, then it's a different story. You get a lot of blowby, and soot starts to thicken the oil in short order. This requires more frequent oil changes. This is the time to use the cheapest thing you can get your hands on, that still has the correct API "C" rating for your engine. Bear in mind, that older engines really don't require what's out there today, but will do fine on the modern oils. Anyways, the worn engine with blowby does fine on the Walmart Super Tech (which meets most standards the other ones do)
Whatever you do, stay away from Castrol 15-40, it's not recommended for HD use by the manufacturer. For use in light trucks, and automobiles which run on diesel.
Internet is full of arguments on the virtues of different brands of oil :lol:
Some guys swear by the Lucas stuff. Personally, I don't believe in making oil thicker with additives. Your pump, and bearings, were designed for the viscosity available in regular motor oils. Thicken that stuff up, and it impairs the flow at lower temperatures, and during startup. If it was good stuff, the engine maker would recommend it. It's prime use, far as I'm concerned, is for trying to get a ruined engine limping along till it can be rebuilt. It's akin to the old trick of adding oatmeal to transmissions, and rear ends, by used car dealers. Lucas isn't any different than the old Motor Honey.
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