JeepsMyName

changed my oil a week ago used Quaker State 10w 40 and a wix filter, now I'm hearing tapping up in the front of the engine under the valve cover, only a light tapping at idle, and of gets worse as I gas it, help would be much appreciated I'm going to pull the valve cover tomorrow.

SeriousOffroad

Make, model, year, mileage?

Before you take anything apart, drain off 1 qt of oil and replace it with 1 quart of Marvelous Mystery Oil. It does a great job of cleaning gum/varnish off internal parts and can also free stuck lifters.

Worth the cost, especially if it prevents needless diassmbly.

JeepsMyName

Its a 2000 jeep cherokee sport i6, I pulled the valve cover off just now I don't see anything unusual, I did drain a quart and put lucas oil in it, ill try the mystery oil when I get it all back together

JeepsMyName

It also has a new head I put on two months ago

98xxxj

They might have got some junk in when they replaced the head. It sounds like someone is tapping the inside of the valve cover with a screwdriver. Some are louder than others. I had to replace my wifes lifters after I did the head on her car because I was careless. Easy to replace if you have to but try the mystery oil first.

JeepsMyName

Thanks an yeah I'm going to get the mystery oil tomorrow, when I put it in do I just leave it in there till I change my oil next time?

98xxxj

I honestly couldn't tell you. I've never used it I've had buddies that have. It should say on the bottle.

JeepsMyName

I've never really trusted with the bottle say lol personal experience is always so much better. but I'll ask around some more

xjsnake

If using MMO don't run it more than 500-1000 miles. I'd tend more towards 500 miles personally.

You already know to use WIX filters so that's great, I'd use Rotella T 10-30 or 15-45 (if in a warm climate) which has zinc which will also quiet down lifter noise.

I run 15-45 in the summer in TN and switch to 10-30 in winter time but where you are you could run 15-45 all year round with zero issues.

Radi

If you have a partially plugged lifter that stuff won't help. Try the MMO and Rotella as suggested.
Why did you replace the head? Old one crack? What does your oil pressure run at hot idle?

JeepsMyName

Okay. Yes old one cracked, oil psi hot is 16 psi give or take a few

Radi

16 should be just fine. I was concerned you might have seriously low oil pressure and the lifters were just the symptom of a larger problem.