Best Engine Oil For A High Mileage Jeep
#61
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Jeep Engine Oil Viscosity
This was taken from pages 82 and 83 of the 1989 Chrysler/Jeep owners manual.
Selecting Engine Oil Viscosity
When changing or adding engine oil select the proper grade by using the chart on the following page. Select the grade that corresponds to the ambient temperature range you expect to encounter before your next oil change.
30*F to 100*F+ 20W-40 or 20W-50
0*F to 100*F+ 10W-30 or 10W-40
-20*F to 60*F 5W-30
This was taken from pages 82 and 83 of the 1989 Chrysler/Jeep owners manual.
Selecting Engine Oil Viscosity
When changing or adding engine oil select the proper grade by using the chart on the following page. Select the grade that corresponds to the ambient temperature range you expect to encounter before your next oil change.
30*F to 100*F+ 20W-40 or 20W-50
0*F to 100*F+ 10W-30 or 10W-40
-20*F to 60*F 5W-30
This is the actual quote from the 1989 manual, page 15.
"Multi-viscosity oils are designed to have characteristics of both light and heavy oils and are available in a number of weights from 5W-20 to 20W-50."
The fact is, this engine design is very low stress, low RPM, standard oil clearances, low friction. Break-in procedure aside, this engine in a daily driver scenario, will run just fine regardless of the engine oil.
#62
CF Veteran
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Pages 82-83 are valve lash adjustments for the V6 engine. They are simply explaining multi-grade engine oils and leaving the decision to the end user. Which makes sense. I guess this was a time before manufacturers would void warranties due to "use of improper oil viscosity".
This is the actual quote from the 1989 manual, page 15.
"Multi-viscosity oils are designed to have characteristics of both light and heavy oils and are available in a number of weights from 5W-20 to 20W-50."
The fact is, this engine design is very low stress, low RPM, standard oil clearances, low friction. Break-in procedure aside, this engine in a daily driver scenario, will run just fine regardless of the engine oil.
That is a hilarious oil thread. The guy copied and pasted all kinds of material and still doesn't have a minute understanding engine oil. That whole thread doesn't contain a single mention of rod and main oil clearance. You guys do understand that rod and main clearance is the prime determining factor for engine oil viscosity right? The guy is fixated on "tractor engines". Tractor engines are generally much more complicated than passenger vehicle gas engines. They require a different fuel, higher cylinder pressure, heck they don't even have spark plugs. Neanderthals, with genetically limited mental capacity, are the folks who compare the Jeep/AMC straight 6 to a John Deere Diesel.
This is the actual quote from the 1989 manual, page 15.
"Multi-viscosity oils are designed to have characteristics of both light and heavy oils and are available in a number of weights from 5W-20 to 20W-50."
The fact is, this engine design is very low stress, low RPM, standard oil clearances, low friction. Break-in procedure aside, this engine in a daily driver scenario, will run just fine regardless of the engine oil.
That is a hilarious oil thread. The guy copied and pasted all kinds of material and still doesn't have a minute understanding engine oil. That whole thread doesn't contain a single mention of rod and main oil clearance. You guys do understand that rod and main clearance is the prime determining factor for engine oil viscosity right? The guy is fixated on "tractor engines". Tractor engines are generally much more complicated than passenger vehicle gas engines. They require a different fuel, higher cylinder pressure, heck they don't even have spark plugs. Neanderthals, with genetically limited mental capacity, are the folks who compare the Jeep/AMC straight 6 to a John Deere Diesel.
Last edited by 00t444e; 07-28-2022 at 12:12 PM.
#63
Seasoned Member
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Nobody said that it couldn't. Pay attention or go back to Pangaea...
#64
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Bro, who the hell runs a gas tractor. When you think "tractor engine", your brain goes to GAS!@? Neanderthal....Tractor engines run sleeves with O-rings and high pressure pumps, giant injectors, diesel fuel, turbochargers, a lot of the inline 6's are 24 valve.
Nobody said that it couldn't. Pay attention or go back to Pangaea...
Nobody said that it couldn't. Pay attention or go back to Pangaea...
#65
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The AMC straight 6 was NEVER a tractor engine!! https://en.wikipedia.org/wiki/AMC_straight-6_engine
That's the kind of crap the British did.
That's the kind of crap the British did.
#66
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