the last post on this was awhile ago, but i just took my z in to get an oil changed 2 days ago. i noticed it didn't have as much balls as it did before i took it in immediately. the dealer used mobile 1 and they used the right weight (made sure to check after i noticed loss of power). I never had a problem will it being sluggish before the oil change. No one had any real input on here of what the problem could possibly be. just off subject about intakes.
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