Lifters making noise after changing spark plugs and oil (to synthetic oil), previously used 5w30 any help..

Ok here is the deal, the lifters are poorly designed and prone to noise or "tick", the way to silence this is not just new lifters but new rocker arm assemblies which include new lifters. Use the best parts not the cheapest ones, factory new one are improved from previous designs. If you still want to just replace the lifters you must take the rockers to a machine shop and have the lifters pressed out and replaced by them. Another suggestion is if you live in a warm climate use 10W-30W synthetic oil.

You have a lifter noise if you leave it at idle does it return and gets louder? and when you rev it up does it go away? If it does you are looking at a failed oil pump. Look at the front main pulley is it wobbly? The reason I ask is the 300 has a high oil pump failure pattern when it fails it takes out the timing chain these you need to beaware of

Change the engine oil and filter.Use a fully synthetic oil this will stick to the lifters where other oils drop down to the bottom of the engine when switched off. leaving the lifters dry. The oil has to travel back up to the lifters when cold and that's the noise you hear.

add lucas oil stabilzer. that will work to quiet lifter noise. there isnt a difference in oil quality

Change the oil. Use Mobil1 5w30, if you are in freezing weather. Guessing that its lifters and then wanting to know the cost will not help you. It will cost $5-700, so you need to be sure thats what it is. Checking oil pressure is the first step.

you should be running 5-30wgt oil in car,

You can use any of the following weights of motor oil: 5W30, 10W30, or 10W40. Personally, I use Mobil1 Synthetic 5W30 in my pickup. Synthetic is better for your motor (you can go 5,000 miles between oil changes with synthetic oils) but once you start using it it's better if you stay with it meaning every oil change you use synthetic oil.

I think it is normal for these vehicles. My '97 Tahoe did it also and I'd heard it was normal and not to be worried about. Kind of sucks but I had 150,000 miles on mine and it was fine.

Good luck.

use one qut. lucas synthetic engine treatment,helps leaks,quites lifters.and 5w30