2000 Jeep Cherokee motor oil suggestions

jeep
cherokee

#1

What motor oil should I use. It has a flat tappet cam that I just replaced because of a wiped lobe. I here todays oil has less zinc then it used to. Any sudjestions?


#2

Tester


#3

I’m surprised a 2000 has a problem with modern oils. Was the failed cam a stock one?


#4

It was the stock cam.


#5

Then in my opinion it was defective, or the oil wasn’t maintained correctly. No modern car should require special oil just to protect the cam.


#6

Did you run the engine @ 2000 RPM’s for at least 20 minutes to properly break-in the new camshaft?

Tester


#7

I’m surprised it had flat tappets instead of rollers.


#8

Why would Jeep install expensive roller lifters in their engines?

Tester


#9

Same reason most cars have them now. As far as I know it is a variety of reasons, fuel economy, lower zinc in oils, longer engine life, and better overall performance. I may be wrong, but…


#10

Roller lifters are aftermarket components.

Not stock in most engines

Tester


#11

The Chrysler V-8 engines had roller lifters starting in 1985. The 4.0 L Jeep engine had flat tappets until the end of manufacturing in 2006. I suspect that old block design would require a redesign to be able to fit guides for roller lifters.


#12

Thank you, I was under the impression most pushrods engines had switched to rollers.


#13

Yes. I also had a high zinc break in oil in it. new cam is fine. I’m just looking for the best oil for flat tappet cam so I don’t wipe out another cam.


#14

Then you’re good to go.

Once the cam/lifters have broken in, use the oil specified on the oil cap.

I think new cam/lifter break-in has to be the most nerve racking event to have to go thru.

Tester


#15

Stock in GM pushrod V8’s since 1986. Stock in pushrod Ford engines since about '88 or so. My 2000 Honda S2000 had roller cam followers as did my 3 valve Ford 4.6 and my DOHC 5.0. I’d say most modern engines have roller followers now.


#16

Tester, what was the date on the article you posted? This one claims no flat tappet cams on any car sold today.


#17

Add a break-in additive to your oil on every oil change. For the life of the car, unfortunately.
Modern oils are not formulated for flat tappet cams anymore.

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#18

On a 2000 model car?


#19

You can’t use break-in oil all the time.

The high phosphorous content will eventually damage the catalytic converter.

Tester


#20

The original cam lasted 9 years, are you planning on keeping this car 9 more years? If I was and it was my car I would use a 50/50 mix of 15W40 Mobile Delvac diesel oil and 5W20 of what ever brand you like.