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I just picked up my first Z about 6 months ago. 91 NA. had the oil changed as soon as I got it. 5w30 Mobil 1 synthetic. The past 6 months it has developed a lifter tick. Goes away when revved past 2k rpm. Really annoying. Tried to cure it with about half a can of seafoam. No luck. Changing the oil cause I don't wanna leave the seafoam in there too long. I do not know what the previous owner had in the car before, but it kept the engine silent. I can figure out whether I should go back to dino, or just go thicker synthetic, (10w30). Also, the temperature around here is around 70-90 Fahrenheit. I've heard that 10w30 is ideal. Synthetic preferred, but dino is fine if it fixes the lifter tick. I just would like to know the ideal oil for my car, and which oil will keep it running as smoothly as possible. thanks!!!!
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