Has anyone run GC Ow-30 in a 4.0 and what did you think?
Jeep 4.0&GC
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I did for a brief period.... There seemed to be too much engine noise for my tastes.
Hiro, What year was your Jeep? Up to about 95 or 96 they suffered from a steep backside ramp on the cam. The valves tended to slam closed causing a lot of valve train noise. It seems reasonable to me that a motor oil that is nearly the viscosity of an SAE 40 at operating temp would be well suited for the 4.0. Was the noise worse at startup or after the engine was hot?
ZmOz, Thin? Where are you getting that?
GC is almost a 40 weight at normal operating temp.
I had a 1993 and a 1997. The '97 simply made valvetrain noise at idle, more when warm then cold IIRC. I purchased it with 60K miles and used Mobil 1 10W30 and either a K&N, Mobil or PureOne filter every 4000 miles. I sold it with 120K on it and no leaks or consumption of any kind. I had tried 0W-30 and 5W-30 in the winter and decided it simply made too much noise, and tried 15W-50 once in the summer and decided it wasn't necessary.
Ive been using Amsoil ASL 5-30 in my moms Jeep 4.0 year round and the engine is silent. Way quieter and smoother than my wrx.
I think to quiet down some of these engines you need a heavy barrier additive package and GC simply doesn't seem to have one despite the fact that it performs well in some vehicles.
--- Bror Jace
--- Bror Jace
What is a "heavier barrier additive package" ?
I use 15w40 Quaker State in my wifes 99 4.0L Jeep.No problems.The problem with the noise in the early 90's engines was piston slap,I was a Chrysler tech until 2003.
"What is a 'heavier barrier additive package'?"
Elevated levels of zinc, phosphorous, molybdenum and/or borate esters.
The oils which most consistently minimize piston slap tend to have higher levels of these additives ... with molybdenum seeming to be especially effective.
--- Bror Jace
Elevated levels of zinc, phosphorous, molybdenum and/or borate esters.
The oils which most consistently minimize piston slap tend to have higher levels of these additives ... with molybdenum seeming to be especially effective.
--- Bror Jace
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