The VG30E engine has hydraulic valve lifters so there is no adjustment possible. You can try replacing the oil and filter, substituting one quart of ATF for one quart of oil. Let it go for 3,000 miles and do it again if necessary. If after the third time the tapping is still there, you will need to replace the hydraulic lifters.
SOURCE: Lifter clicking sound in 4.6 engine
it could be your tensioner. it sounds like a clicky squeak. sometimes it may go away but it always comes back. thats what mine is but i havent fixed it yet. i doubt you can grease it, you probably need it replaced. not expensive, at least the part should be under 100 bucks
SOURCE: Valve Lifter Noise on 2001 525.
The Castrol synthetic 5W20 oil may be too light for your car. None of the following three sources recommend 5W20 oil.
Per Bentley manual for 1999 and later E39 BMW (excluding M5), BMW HP 5W30 synthetic oil (07 51 0 017 866) is recommended.
Per the Mobil Oil web site, Mobil 1 synthetic 0W40 oil is recommended.
Per the Castrol Oil web site:
SM 5W-30 - Thank you for inquiring about what oil is best for your
vehicle. Based on the information you provided, your vehicle requires a
special engine oil that can only be purchased at your local dealer.
Please visit your local dealer to ensure that your vehicle is serviced
properly.
Does the noise vary or is it constant? Noticed only at startup or all the time?
Another ticking noise source could be the VANOS unit.
PT Stanley
SOURCE: weired sound in engine arround 2100 rpm, pathfinder 2005
Take a look at Nissan Technical Service Bulletin NTB05-15b. Title = "Rattle Noise From Vias Power Valve Actuator / Intake Manifold Collector" This appears to describe your problem exactly. I have the same problem with my 2005 Xterra and I am going to try the recommended fix myself at home.
regards,
Willyswan
SOURCE: just need to know the towing capacity for a 1994 nissan pathfinde
The towing capacity is 6000 pounds.
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