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I just bought a 97 LX665 and I've decided to change the fluid in the hydraulic system to be sure it's clean but now I'm not so sure. I know it's supposed to have a diesel grade 10W-30 oil in it but the previous owner told me he had R&O hydraulic fluid in it. Now I don't know if I should change...

I just bought a 1997 LX665 and I'm changing the engine oil and hydraulic fluid for the first time on my end. Is it true that I'm supposed to run 10W-30 in the motor? That's what I'm told by the dealership, which is odd. I also had one dealership tell me to run 10W-30 for the hydraulic fluid...