There is a product you can buy called Lifter Free. It is an oil adittive and can be placed in your oil filler along with your oil. This will improve the knock from the lifters but wont fix the issue. I have had cars with Lifter noise and used the adittive and they were fine and it took alot of the knock away. The adittive allows them to move with less effort. Hope this helps. I wouldnt worry though noisey lifters wont hurt your engine try owning an LS1 ! lol its been knocking since day 1 ! and its still making great power and runs fine and i punish that thing.
Also, dont leave the adittive in there for to long. do an oil change after 5,000 Kms. Cheers.
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