This forum is VERY useful. I have a new 2014 4WD Cherokee with about 2500 miles. On board gauge indicates that oil is only 25% spent.

Questions:
1) Is oil gauge "smart enough" to really tell one when to change oil ?

2) When do you guys suggest I perform 1st oil change. In past, I change oil and filter every 4,000 miles and do NOT use synthetic oil.

3) At 1st change, should I switch to a synthetic 5W-20 and if so, how often to change or should I trust on board indicator?

Thanks,
Bill from Mass who really likes his 1st Jeep :-)

 

I always do the 1st. oil change on a new vehicle around 1k mi, though this isn't as necessary as it used to be, since tolerences in engines are much tighter these days there aren't as many metal shavings created during break-in as there used to be. My Mustang claimed that you could do the 1st change at 5k mi (8qt system capacity with factory-fill synthetic) on the 5.0L TIVCT ("coyote") V8 though I changed it at 1k mi anyway.


At 2,500 mi I would probably change/have it changed soon, even with a modern engine I wouldn't go beyond 3k mi on the 1st change. The oil-life monitoring system is useful after the 1st change but there are allot more contaminates (both shavings from break-in and fuel/combustion gases that slip past the rings before they are fully-seated) introduced during initial break-in (the 1st. 1k mi. or so) so you don't want to wait for the oil-life monitoring system to tell you to change it, the oil-life monitoring system is a computer estimate of oil life based on your driving habits but it doesn't actually sample/test the oil.

Synthetic is a good idea, especially for modern DOHC engines where the oil spends more time on the head (hottest part of the engine) and the additional timing parts have a greater tendency to shear the oil. Whatever oil you use make sure to use a good filter (OE or better). I usually go by 3k mi for regular oil and 5k mi for synthetic, while many modern vehicles can go longer, oil changes are relatively cheap (especially if you do them yourself), and definitely cheaper than rebuilding/replacing a sludged-up motor.


Your driving habits have a major effect on oil life as well (the oil-life monitoring system will pick up on this), lots of short trips and city driving are allot harder on the oil than highway driving is.

 

I had mine changed at 2000 miles on my V6 TH. Used to build cars; we always changed the first time fairly early to remove shavings etc. Old habits die hard.

Dealer gave me nine free oil changes with my purchase. Argued with me that 2k wad too soon. Told them to change it anyway, my truck my decision.

 

Most people these days change their oil way too soon, which ultimately costs money.

Bottom line: learn to check your own oil. The time-tested dipstick check is the surest way to know whether you can go 3000 miles or potentially 7500 miles based on your driving habits.

No: don't necessarily rely on the computer estimate. When you see your own observations matching up with the computer estimate, then you can trust it. But any hard, off-road, dusty driving will shorten your oil lifespan and the computer won't realize it in time.

 

Basically, its a timer. After you reset it, it counts down to the next 3k or 3 months usage.

 

In a way yes, though it isn't 3k mi or 3 mos., it usually ends up being some-ware between 5k mi and 10k mi depending on your driving. It is also more than just a simple timer, it takes into account factors such as temp, rpm, length of idle, # of starts/heat cycles, etc.


However it cannot factor in things such as dusty/dirty conditions or the additional contaminates that end up in the oil during break-in.

 

I was trying to simplify it but your explanation works too. Lol

 

I'm probably going to change mine for the first next month at around the 3K mark. I've given my 4 cyl a workout over the last 4 months.

 

What brand/type are you going to try?