Someone can correct me if I'm wrong with this statement. but by how much? I think this stuff can only make a serious difference in seriously worn engines with excessive clearances to fill.Īlso, I would think that bright stock would be more shear stable than the polymer-based STP. It does have a lot of tackiness/stickyness and is used as a “climbing” additive in gear oils. More slippery? Without friction modifiers? (which should have shown up on a Timken test) I don't see how this could be true. mebanditws6: "The Lucas is more slippery than regular oil. Of course, in warm weather, why not simply go with a straight weight? I just picked up some Pennzoil straight 40 for use in our (overtaxed) 10hp John Deere snowblower. Perhaps someone can do a little calculation as to an equivalent weight if you started off with 4 quarts of 10W30 and added 1 qt of LHDOS? I'm guessing you would end up with something close to 15W40 or 20W50. and then the engine will almost certainly be better off. but then, an oil & filter change is fairly cheap when compared to this stuff ($8 U.S. I would only use something like LHDOS in an “emergency” or in lieu of changing the oil and filter. On an older vehicle with some wear, you might be making the best of a less-than-ideal situation, but you would be much better off starting off with a heavier oil if you are changing it. I agree with other here who take a dim view on sustained use of STP, Slick-50 and/or Lucas HD Oil Stabilizer.
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