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Yes, and only if the rocker arm was not adjusted correctly while using the 50 weight oil. If your rockers are adjusted to specs, then it won't make much difference which oil you use.
If your adjustment was 'just barely' with SAE50, then you will notice a light tap with SAE30. I would readjust with any oil change, just for assurance.
engine question
, or a number of other parts
start tapping.
