Conventional or Synthetic Oil?
10-22-2008, 07:02 PM
#1
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Year: 1989 2x
Model: Cherokee
Engine: 4.0L Straight 6
Conventional or Synthetic Oil?
I heard somewhere. I want to say Trucks! or 4x4 TV on spike. Anyway, I thought I heard that in older high mileage engines it is better to run conventional oil because it is thicker and less likely to get by seals and such. On the other hand I have heard the exact opposite. Currently I am running Valvoline 75000+ High Mileage Syn. Blend. 
10-22-2008, 07:06 PM
#2
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on high millage vehicles, is recomended if it always run on conventional, stay conventional,, if it run on syn you can run syn, but I suggest conventional,, if it has never run on syn
10-22-2008, 07:09 PM
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Year: 1989 2x
Model: Cherokee
Engine: 4.0L Straight 6
I don't know what prior owners ran in it. I changed the oil a week after I bought to be safe ya know and I used the same stuff I ran in my 84 Jimmy.
10-22-2008, 07:54 PM
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Year: 1988
Model: Cherokee
Engine: 4.0
hey JeepersCreepers how good is amsoil i got a friend out here who swears by the stuff but whats your opinion on it. and as far as the op i would stick with conventional oil
10-22-2008, 07:57 PM
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Year: 90
Model: Cherokee
Engine: 4.0
It really depends on the condition of the motor...
I have customers that have had no problems and ones that have had to replace seals, gaskets and etc.
If you have alot of miles and suspect the condition of your seals and gaskets, then stay conventional.
My main concern would to make sure you are staying with an oil with the correct amount of Zinc and Phosphorus. You want to make sure the oil meets the older API-SL rating.
I have customers that have had no problems and ones that have had to replace seals, gaskets and etc.
If you have alot of miles and suspect the condition of your seals and gaskets, then stay conventional.
My main concern would to make sure you are staying with an oil with the correct amount of Zinc and Phosphorus. You want to make sure the oil meets the older API-SL rating.
Last edited by whowey; 10-22-2008 at 08:02 PM.
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10-22-2008, 08:00 PM
#8
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Year: 90
Model: Cherokee
Engine: 4.0
I have a racing oil with a SAE 60 vicosity. You are not going to find a conventional oil out there at that rating.
Or another lower vicosity oil may have been treated with a viscosity improver like Lucas Oil Stabilizer.
10-22-2008, 08:13 PM
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Year: 1992
Model: Cherokee
Engine: 4.0L
I used to work at a dealership and I had customers swear by it too so I started putting in my vehicles. Listen to Whowey, He knows what hes talking about. I also have to run lucas oil with my Amsoil cause Im burning oil.
10-23-2008, 03:09 PM
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Year: 1989
Model: Cherokee
Engine: 4.0l
I run Polaris ATV full synthetic oil in all my vehicles.and have since 1988 never a oil related problem..The old chevy 225,000 miles still purrs like a kitten
10-23-2008, 04:41 PM
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Year: 1989
Model: Cherokee
Engine: 4.0l
Yes 4 cycle oil in the vehicles.(ATV)VES Gold is the full synt. 2 stroke oil...for variable exhaust 2 stroke snowmobile engines..hehe can u tell i work in a Polaris dealership