BOBISTHEOILGUY
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quote:
Originally posted by 7tford:
Bob: I've never added anything to any of my fluids except maybe once about 10 years ago I tried "Slick 50" in one of my vehicles. Started using synthetics about the same time and have been experimenting a bit with different manufacturers since. Very interesting test. I am wondering if anyone has had any experience with Castrol "Syntec" 75W-90 gear oil? Is the fact that the Pennzoil didn't climb the gears initially in the experiment of great concern? Do other synthetics behave this way? Would it have clinged any better if the temp was say 0? Gear oil depends on a splashing effect to lubricate. The faster the gears spin the more it lubricates. The general purpose of lucas is to get the oil on the parts sooner thus no dry runs. Keep in mind, the gears are put under a heavy load as soon as you start to move. The total wieght of the vehicle is placed on those gears from the start and at that time, when first pulling out, there is no lubrication pumping or splashing on those gears so climbing at first can be a good thing. I have yet to see any OTC gear oil climb. There may be one or two specialized oils but not any OTC oils do this. Redlines super shock I tried this on did not climb but.. it painted everything once the spash effect started to take place, and did not drain. It painted everything like a paintball and stuck to where it hit. Fact is, I will never put that stuff in this demo machine again as it took 4times the work to clean it off the machine. The climbing action of a gear oil can be extremely important when talking about a big truck or farm tractor rear end due to the fact it starts out with a heavy load and moves slowly at first which cannot supply an addiquate splash of lubricant at the slower speeds.
I can see the importance of cold start lubrication in an engine but is it really that critical in a gear set for that short of a time? See previous answer
Also, how is the addition of friction modifier to a limited slip differential compare as an additive in the context of your experiment? Lucas has no friction modifiers in that product. It is a pure petroleum base stock commonly called bright stock by some. This mainly effects the viscosity of the oil but no other properties. In my little machine, there was no load to speak of. It was just demonstrating how a product can climb and in this case showed how the addition of an additive can destroy the balance of an additive package in a perfectly good lubricant. Friction modifiers of any sort would not have changed the outcome of this test IMO. As for how it could effect an oil by adding more friction modifiers, an overload of additives can imbalance an oil, say in the case of FMs added, it can lay a heavy coat of fms on the metal surface and actually cause the detergents not to work and allowing the oil to oxidize faster due to the fact the detergents cannot clean. Not all additives can be as obvious as in the case of lucas but through analysis, it can show up. I hope that answers your questions.
bob
Thanks.
