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Old July 18th 05, 04:50 AM
Jerry Bransford
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There's no way I'd ever switch away from the '97 TJ's factory
recommended 10W-30 to anything as heavy as 20W-40 or 20W-50. The 40 and
50 viscosities those operate at when warmed up are more difficult to
pump through the engine's oil journals than is necessary and just makes
the oil pump work harder. Plus the 20W viscosity it is before it warms
up is harder to get pumped into the engine when it's cold which can
cause reduced lubrication at startup, which is where much of an engine's
wear comes from. Leading oil manufacturers are now even recommending
5W-30 over 10W-30 since it gets into the engine faster at startup yet it
is still a good 30 weight viscosity when it gets up to normal operating
temperature.

On your coolant and water mixture, it should be no stronger than 50:50.
The more antifreeze used, the less efficient the mixture is at cooling
the engine.

Jerry

Endo wrote:
> The fan clutch sounds probable, and I will probably flush it too just to be
> safe but the antifreeze in it is only about a year old and still nice and
> green. Maybe it's too strong a mixture and I need more water.I will get a
> bottle of the Redline Water Wetter too just to help out.
>
> I will consider a heavier weight oil also, i'm due for a change now anyway.
> Too bad Wally-World only carries Valvoline full synthetic in 10w30 so i'm
> going to have to go to a 'real' parts store like Auto Zone. (sic)
>
> Shawn
>
>
> "L.W. ("ßill") Hughes III" > wrote in message
> ...
>
>>Hi Endo,
>> I'd flush your system like you've doing every two years to avoid
>>the electrolysis that'll eat the head gasket, water pump seal, and core
>>plugs. And go ahead and replace the fan clutch.
>> The oil temperature lags behind the water, but eventually catches
>>up, if you had checked it you would have seen it with the constancy of
>>water, with about the same lubricating qualities. If your going to get
>>caught in traffic jams, then switch to 20/40, or 20/50 like I use at
>>three hundred thousand miles. Remember pickups with the trailer package
>>also have oil coolers.
>> God Bless America, ßill O|||||||O
http://www.billhughes.com/
>>
>>Endo wrote:
>>
>>>I was idling in traffic on the 4th waiting to get into parking at the new
>>>Heinz Field in Pittsburgh for fireworks and all of a sudden my temp
>>>jumped
>>>up to just below the red and the 'check gauges' light came on. I did a
>>>quick u=turn and got into a non-congested lane and got moving to get some
>>>air flowing and it calmed down to a little over 210, but just a hair
>>>higher
>>>than usual. I was running the a/c on max since i had the top on still.
>>>Shortly after it cooled back down to a more reasonable level I noticed
>>>another strange problem....when I came to a stop the oil pressure would
>>>dive
>>>down to zero and the light would come on again. Once it cooled down for
>>>good after parking for awhile this went away too. It's done it a few
>>>more
>>>times since and it's usually during slow driving with the a/c on. The
>>>oil
>>>level seems fine and it's Valvoline full synthetic 10w30. Coolant is
>>>topped
>>>off and is a nice green color, not nasty stuff.
>>>
>>>Any theories for this happening?
>>>
>>>Shawn

>
>
>


--
Jerry Bransford
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