Posted by Tom Fleming on June 03, 2010 at 03:57:21 from (72.4.231.242):
In Reply to: lawn mower oils posted by pocvalfm on June 02, 2010 at 17:37:28:
CNKS, I am with you on that one. Just to clarify why HD oil is not the best for hydraulic systems. HD oil will foam a bit, and also hold air bubbles longer. HD oil will NOT, I repeat NOT hurt a hydraulic system. However, since it foams a bit and holds air bubbles it does not perform as well as non-detergent oil. under heavy work in a hydraulic system, it will not "respond" as quickly or "snappy" as hydraulic oil (in other word, the hydraulics will be spongy). BUT, it will not hurt anything, and you probably won't notice the difference. i doubt that the lower pressure systems on the letter series tractors would be bothered by it. I have always followed the HD for engines and non-HD for compressors and hydraulics. If the latest HD oils from CIH or others have been formulated differently as to not foam or hold air, then I too am learning something new.
i am amused and sometimes disgusted at all the "yapping" about the different oils for these older tractors and lawn mowers. Clean oil and filters with appropriate viscosity is more important than what brand, multivis, HD or non-HD, etc. If these were high RPM, high compression, hi-temp, high performance engines, you would be getting a different answer from me. Also, unless you are really working the IH letter series diesels hard, they do fine also with good, clean HD 30 oil. If all you are doing is showing, and not working the snot out of a tractor, keep your oil clean, filter changed, and the engine will outlast your lifetime.
I am not against the "hi-perf" oils (they have their use and purpose), but in the end, losing sleep over whether or not to use HD 30 in your Farmall cub or your Murray lawn mower is just plain hogwash (no offense at all to the original poster). sorry for the rant, but this gets under my skin sometimes. We have new collector's and "younger" people coming to this site for information and to learn. Hopefully we can teach them not only the "what" but the "why", and stear them away from the "shade tree mechanics".
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