CA Hydraulic/Transmission Oil

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   CA recommended SAE 10W <40f, 20W >40f
I bought hydraulic fluid at NAPA, showed them a picture of the 10W20 product I wanted, paid, but they brought out a 30W product and put it in the car.  I didn't pay attention that they didn't give me what I asked for.  Anyway, the pump works well but sometimes it takes a while longer than desired to prime.  Nobody uses SAE oil ratings for hydraulic fluid any more, and it's not clear what the best ISO grade to use is:

SAE 10 weight viscosity:  45mm**2/s at 40C, 7.0mm**2/s at 100C
SAE 20 weight:  61mm**2/s at 40C, 8.5mm**2/s at 100C
ISO 32 weight:  32mm**2/s at 40C, 5.5mm**2/s at 100C
ISO 46 weight:  46mm**2/s at 40C, 7.0mm**2/s at 100C
ISO 68 weight:  68mm**2/s at 40C, 9.5mm**2/s at 100C

None of the ISO ratings match the original specs.  I don't suppose those were too precise.  I'm inclined to go with ISO46AW.  But that seems to equate more closely to a SAE 10 weight.  Hopefully, the "AW" additives will help make up for any differences.  yes/no?

Why are they rating these at 40C??? that's 104F (and 212F).

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dfwallis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 09 Mar 2023 Location: DFW Points: 876	Post Options Post Reply Quote dfwallis Report Post Thanks(0) Quote Reply Topic: CA Hydraulic/Transmission Oil Posted: 2 hours 51 minutes ago at 12:26pm
	CA recommended SAE 10W <40f, 20W >40f I bought hydraulic fluid at NAPA, showed them a picture of the 10W20 product I wanted, paid, but they brought out a 30W product and put it in the car. I didn't pay attention that they didn't give me what I asked for. Anyway, the pump works well but sometimes it takes a while longer than desired to prime. Nobody uses SAE oil ratings for hydraulic fluid any more, and it's not clear what the best ISO grade to use is: SAE 10 weight viscosity: 45mm2/s at 40C, 7.0mm2/s at 100C SAE 20 weight: 61mm2/s at 40C, 8.5mm2/s at 100C ISO 32 weight: 32mm2/s at 40C, 5.5mm2/s at 100C ISO 46 weight: 46mm2/s at 40C, 7.0mm2/s at 100C ISO 68 weight: 68mm2/s at 40C, 9.5mm2/s at 100C None of the ISO ratings match the original specs. I don't suppose those were too precise. I'm inclined to go with ISO46AW. But that seems to equate more closely to a SAE 10 weight. Hopefully, the "AW" additives will help make up for any differences. yes/no? Why are they rating these at 40C??? that's 104F (and 212F).
	1952 CA13092

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Les Kerf Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 May 2020 Location: Idaho Points: 1377	Post Options Post Reply Quote Les Kerf Report Post Thanks(0) Quote Reply Posted: 1 hour 51 minutes ago at 1:26pm
	Considering the 'relatively' light work your CA will likely see in Texas, I would use the ISO 32. If you intend to cultivate cotton in 95 degree heat for 12 hours at a time then use the ISO 46. The ISO 32 works perfectly in my somewhat cooler climate here in northern Idaho, ISO 46 is somewhat sluggish.

Dennis J OPKs Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: Overland Park, Points: 544	Post Options Post Reply Quote Dennis J OPKs Report Post Thanks(0) Quote Reply Posted: 1 hour 31 minutes ago at 1:46pm
	I have used straight 30w non-detergent in KS, not zero temps and it works fine.