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Old 07-04-2008, 06:43 PM   #1
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Oil Change stuff

Hey everyone.
I have a 2003 Wrangler X, I bought it last December with 71250 miles on it. I do not put on alot of miles but i do put about 6 miles a day just going back and forth to work. I now have 73567 miles on my jeep after having it for 7 months. Shortly after i bought this i put in Mobil one 10w30 oil, because thats what i have used in other vehicles that i have had. I also use it because of the freezing temps here in the winter. How ever when i checked the oil today it is down on ADD. It has been over 5 months since i switched it over to synthetic oil and only driven it about 1400 miles since the switch. Also there are no leaks anywhere, and no noticable smoke from the exhaust.
My question is would you guys or gals stick with mobil one synthetic and switch it to a 10w40, or would you switch it back to a conventional oil? I also do not know what kind of oil was used in this from the start since i bought this from a dealership. I am also the 3rd owner of this jeep. I assumed it was well taken care of because the body was in excellant condition and looks like it was well taken care of. My second question is that being i drive so little and takes forever to add up miles for decent oil change intervals, Should i start changing oil every so many months instead of waiting till it gets to 3000 miles like i usually have done?

I would like your input and ideas. I hope i do not have anything wrong with my jeep cause it does run so good. I haven't had no problems with it at all and the engine sounds so good with no weird noises.

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Old 07-04-2008, 07:22 PM   #2
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Originally Posted by scotiez View Post
Hey everyone.
I have a 2003 Wrangler X, I bought it last December with 71250 miles on it. I do not put on alot of miles but i do put about 6 miles a day just going back and forth to work. I now have 73567 miles on my jeep after having it for 7 months. Shortly after i bought this i put in Mobil one 10w30 oil, because thats what i have used in other vehicles that i have had. I also use it because of the freezing temps here in the winter. How ever when i checked the oil today it is down on ADD. It has been over 5 months since i switched it over to synthetic oil and only driven it about 1400 miles since the switch. Also there are no leaks anywhere, and no noticable smoke from the exhaust.
My question is would you guys or gals stick with mobil one synthetic and switch it to a 10w40, or would you switch it back to a conventional oil? I also do not know what kind of oil was used in this from the start since i bought this from a dealership. I am also the 3rd owner of this jeep. I assumed it was well taken care of because the body was in excellant condition and looks like it was well taken care of. My second question is that being i drive so little and takes forever to add up miles for decent oil change intervals, Should i start changing oil every so many months instead of waiting till it gets to 3000 miles like i usually have done?

I would like your input and ideas. I hope i do not have anything wrong with my jeep cause it does run so good. I haven't had no problems with it at all and the engine sounds so good with no weird noises.
Well first off, let me state that just because the appearance of the jeep is good, does not mean that the previous owners changed the oil as often as they should have. The spec for your engine is 10w-30 weight oil in all temperatures. It is normal for a broken in engine to use a slight amount of oil. The 4.0L inline six are not known to be oil burners, but they will consume a little oil and alot of them leak at the main and valve cover gaskets. Since synthetics do not thicken up as much as conventional oil at low temperatures, they can leak a little more.
SInce you do not know what type of oil the previous owners used, and if the engine is allready sludged up, I would probabally use regular oil in the warmer months and a synthetic blend or full syn in the winter to save some money.
I run full synthetics in the vehicles that I have bought new becuase I do not want the sludge forming in the oil passages to begin with.
The oil companies like to advertise that you should change your oil every 3,000 miles, partially becuase they can sell more oil. The auto manufacturers like to usually state 5,000 to 7,500 or more miles because they dont want your engine to last forever. (its all about continued business).
Since your dealing with a six quart engine i would personally change it every 3,000 to 4,000 miles. If you really want to know what shape you oil is in, you can take a sample and send it off for a chemical analysis, which costs as much if not more that an oil change itself.

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Old 07-04-2008, 09:22 PM   #3
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How many quarts did you put in when you changed it ? The 4.0L I6 take SIX quarts, not five. If you take it to an oil change place they by default put in 5.
Your kind of driving is also the hardest on the motor and oil, it never heats up and it never cooks off the moisture that collects in it. Thats the definition of 'severe duty'...
You need to drive it at least 30 min to heat the oil up to the same temperature as the engine. Drive it to work that 6 miles then shut it off and pull the dipstick, the oil will be warm or might even still be mostly cold.
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Old 07-04-2008, 11:23 PM   #4
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I know the appearance of the jeep does not mean it was well takin care of, but its a step in the right direction. During my test drive i noticed that everything is very tight, and the oil pressure is right up there like it should be. Also no rust anywhere. I believe that most of the miles were highway miles being the jeep is from the western part of the state, and thats pretty baron country. I also have no leaks under the hood. The motor is clean as a whistle. For right now i'll take your word for it that after a few miles gets put on that it consumes a little oil. I am going to get the oil changed tomorrow and see how it is in a few months from now.

I also did put 6 quarts in it when it was changed last. I'm not a newbee at this kind of stuff... just to jeeps. All my life i have had GM vehicles and most of the used ones i have boughten the motors were crap. In fact even my last GM vehicle, which was new the motor was crap with that too. Thats another reason i switched from GM to Jeep.

OH and its 3 miles to work and 3 miles back, and i do know that this is considered severe driving. How ever i did think that being i put so few miles on that i could still go 2 maybe 3 thousand miles. But it takes forever to get that many miles on. I think i'll switch to changing it every 3 months instead.

Everything is kinda new to me these last 10 years. I used to live in the country by the river, and the 97 flood took my house and everything i owned. I ended up buying a house in town, and thats why i drive so few miles now. Guess i just have to change my ways of things, or do more frequent oil changes even though the miles don't show it.
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