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No leak....just a little low. Everything I've read says do not use synthetic so I am a little confused.I don't see why you can't use synthetic fluid and any of the ones C.T. sells will likely be fine. Do you have a leak?
I couldn't see anything that said GM's was or was not synthetic, but I always thought it was semi synthetic. You just don't want the oil to compress obviously so I can't think of a reason to not use synthetic.No leak....just a little low. Everything I've read says do not use synthetic so I am a little confused.