Originally Posted by scotiez
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.