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post #1 of (permalink) Old 03-01-2003, 01:00 AM
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What viscosity of motor oil should I run on my 258

Going to change my oil and was wondering what weight and brand of oil does everyone use? My motor has low miles and I was thinking that its time for synthetic.
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post #2 of (permalink) Old 03-01-2003, 03:20 AM
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Re: What viscosity of motor oil should I run on my 258

1. 10W30.
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post #3 of (permalink) Old 03-01-2003, 04:12 AM
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Re: What viscosity of motor oil should I run on my 258

i run 15/50 mobile one in newer engines
20/50 valvoline in everything else
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post #4 of (permalink) Old 03-01-2003, 07:54 AM
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Re: What viscosity of motor oil should I run on my

local parts guru and my rebuild guy said 10w/30
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post #5 of (permalink) Old 03-01-2003, 08:39 AM
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Re: What viscosity of motor oil should I run on my

10w-30, the lower number stants for winter conditions. the higher number is for the summer. The lower the bottom number the thinner the oil is when it is cold. The higher the top # the thicker the oil is when it is hot out. If your vehicle has low miles on it then use 10w-30. You will get a lot of mileage out of the engine as long as you change the oil every 3000 miles. I wouldn't shell out the extra money for the synthetic oil unless I had a high performance engine. Such as in a Corvette or a motorcycle where the engine is likely going to get abused and redlined. Acceleration puts the most stress on an engine. Your not going to be racing in your jeep so your not going to need the extra protection.
post #6 of (permalink) Old 03-01-2003, 12:17 PM
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Re: What viscosity of motor oil should I run on my

Might want to use a little thicker like 30wt or 15w40 in the summer if you live in a hot area. And if you have low oil pressure, the thicker oil will help with that.
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post #7 of (permalink) Old 03-01-2003, 02:43 PM
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Re: What viscosity of motor oil should I run on my

The oil galleys in the 258 are (supposedly) rather large. I run strait 30 wt. all of the time. But will listen to a good argument for 10w30.
post #8 of (permalink) Old 03-01-2003, 03:43 PM
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Re: What viscosity of motor oil should I run on my

I think there is a misconseption on how multi-visc. oils are rated. I was told for example a 10w30 is a 10 weight oil but has the lube properties of 30 weight. Anybody know for sure or are you guessing?
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post #9 of (permalink) Old 03-01-2003, 04:13 PM
 
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Re: What viscosity of motor oil should I run on my

I'm pretty sure that 10w-30 has the viscosity properties of 10 weight oil when it is cold, but has the properties of 30w oil when it is hot. The oil is still thinner when it is hot than when it is cold. When 10w-30 is cold, it flows like regular 10 weight would flow at the same temperature. When 10w-30 is hot, it flows like regular 30 weight would at that same temperature. Clear as mud? [img]images/graemlins/wink.gif[/img]
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post #10 of (permalink) Old 03-01-2003, 04:19 PM
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Re: What viscosity of motor oil should I run on my

1. May I recommend:
2. What does the weight mean on a can of motor oil?
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