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?

[image] Engine Break In Oil Lucas Break-In Oil helps seal new rings while providing excellent extreme pressure properties that protect the entire valve train and camshaft. Especially designed for flat tappet camshafts, but can be used wherever you need the extra wear... …

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

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.

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

[image] Purebred: I’m surprised it had flat tappets instead of rollers Why would Jeep install expensive roller lifters in their engines? Tester

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…

Roller lifters are aftermarket components. Not stock in most engines [image] Performance Perspectives: On a Roll(er): Cams, Lifters & Rockers | MOTOR When someone talks about his engine, or about an engine that he plans to build or buy, the term roller is sometimes bandied about, often w…

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.

2000 Jeep Cherokee motor oil suggestions

Maintenance/Repairs

Purebred June 9, 2018, 7:29pm 7

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

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2000 Jeep Cherokee motor oil suggestions

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