Sir,
How cold I can't answer as I don't know what you do when 15W oil turns to grease....(better find a hole in the ground). I know JD runs it and Deeres are everywhere. With that said, I do know that the lower the viscosity ( 15w vs 90w), the flatter the "trajectory" and when the temp turns for the worse, the less variation you have on "thickness" and the less impact you have on your equip. Thin oils don't get thick real fast like thick oils do.Again, unless you are rich, and I am not, our equipment is roughly '60's vintage and fluids now vs then are day and night. We can get super performance over extremes of temp with light weight fluids that are available to us today. If you have clean lube in your system, I doubt you will wear a pump out. Remember, it only takes one oil molecule to keep metal off metal. What will happen is that the light fluids in the summer will thin out and will find weak points in your hydraulic system, squirt out and cause loss of lift. So, I think you primary concern is more of ability to lift, rather than damaging equipment. Can't answer your concern about foaming. My association with foaming has been with filling a reservoir too full and the resultant beating, like a crankshaft hammering an oil reservoir (crankcase) when the oil is up too high. In the auto industry they caution you on ATF that if it gets too full and foams it doesn't work. I have seen bubbles on the TX dipstick on my trucks on a hard trip but never lost a tranny because of it. Pulled lots of trailers. At 62, with a lifetime of loving and lovin engines, I find that clean oil and the right amount (dipstick at the top) will cleanse a lot of sins. And if it's too thick to run cold, get something that will flow. If that doesn't help come back and we'll go again. I just didn't want you to blow a hole in your leg with a filter on the high side. Best, Mark
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