I have look on the forum on oil changes, but mostly the 4.0L came up. Just to be on the safe side what oil do you recommend for the 2.5? would 10w30 do, i live in Hawaii? How much bottle of oil does it take? I'm thinking about going with castrol high mileage motor oil not synthetic. The vehicle currently have 128k no oil leaks so far. Already invested in the K&N filter.

 

I would recommend 5w-30 or even 5w-20 synthetic Mobil 1, Castrol, or royal purple all depends on preference..

 

5w30 is almost like 10w30 but isn't 5w30 better for the cold? I live in hawaii so the temperature never goes below 70, so should i still use 5w30?

 

10w10 would be just fine. but in my opinion if you switch to synthetic now you might be refilling your oil in a couple weeks

 

You could use straight 30 weight if you wanted.
4 quarts is what you need.

 

so 10w30 would be much better? If i was back in illinois ill probably run 5w30. but hawaii i dunno lol.

 

I use 10w30 Castrol GTX, and it's runs perfect with over 250k of freeway miles in the hot and cold extremes of central California. I think "high mileage oils" are a scam, I've driven everything from hondas to trucks with well over 200k that have used the same oil their whole lives, mostly mechanic shop 10w30 (service pro). They run forever as long as you don't change the weight and composite just stick with one.

 

In your warm climate, the thinnest oil I would use is 10w-30. 10w-40 would be most Ideal, 2.5 and 4.0s shed the least amount of Iron(Cylinder walls, rings, lifters and their bores, etc) with a good 40 weight oil. Straight 30 weight is also one of my favorites, Quaker State. A good 15w-40 weight Diesel oil(Delo 400, Rotella T) is the optimum oil for the 2.5 4 banger and the 4.0 in my opinion.

 

The reason the owners manual dosent specify a 5w-30 oil is because a 5w oil drains off the cylinder walls where a 10w oil will stay put longer. True a 5w does flow faster at start up, but there are alot of viscosity improvers in a 5 weight oil to get it to a 30 weight. A 10 weight oil has more actual oil in it that a 5 weight multi-viscosity does because it has less viscosity improvers in it. Think of it as this way; how many times must a 5 weight oil multiply its self to get to that 30 weight? 6 times, right? Now how many times must a 10 weight oil multiply its self to get to a 30 weight oil? 3 times, right? The oils increase their viscosity from their cold weight(5w, 10w, 15w, 20w) to their operating temp weight(30, 40, 50) with viscosity improvers, and the least amount of viscosity improvers, the more durable the oil. Also, the 5w-20, 5w-30, 10w-30 oils are all Energy Conserving, and have lowered levels of Zinc/Phosperous, which our Jeep 2.5 and 4.0 engines Need to keep their flat Tappet cams and lifters ALIVE!

 

What's the temp there?? Should be what 70-90 year round? I think people are over reacting on the temp, if you read bobtheoilguy.com he would recommend 5-20..

 

put 5w-20 in your hybrid hondas but if you put pressure and heat on your engine then it needs a heavier oil to keep the cylinders running smooth.

My local weather temperature ranges from 35F in winter to 110F in the summer with low humidity, heavy rain and only snow when we go up to the mountains. I can tell you it's hell on the engines traveling over the altamont pass headed toward the bay with the a/c blaring and full sun beating the car. Ive only been caught overheated once in my family's 2000 ford explorer (rightfully named ford exploder). We have mechanics in the family and my first job was in a mechanic shop. Since I've left for school it's no longer my profession but what's stayed consistentant is the oil. 5w-30 for newer cars and 10w-30 after 100k is my personal rule.

 

Everyone has their own opinion, and I understand that. That's why personally I'd never ask an Internet forum what type of oil to use, because just as in this thread, you'll get a different opinion from everyone. I read the owner's or shop manual for oil specs and follow those.

BUT, to say that 5w-20 should only be used in hybrid hondas is just plain wrong. In fact, my 300+ HP Mustang GT uses as just as the manual states. In fact, many new modern high horsepower engines use it. Now, I'm not saying it should be used in an XJ 2.5 or 4.0, but people really need to think about what they are typing.

 

Exactly correct. The best decisions is made from that of an experienced person. If we were talking about brand new engines in your 2011 camaro convertible or ford gt500 then for all sakes you should follow the manufacturers specifications. As far as me, I don't have the money to buy a new car yet so I just follow the many years of experience before me that have followed these paths before and had that experience.

The main point I wanted to make is to just pick a weight and viscosity and stick with it because changes with key components such as oil don't go over well in any engine. Different locations require different needs so your best opinion would be that of your well experienced neighbor.

 

Stick with 10-30 it has ran with no leaks for 128k then stick with it... don't mess with whats not broke... and use regular oil.. if you switch it will leak like a broken dam...

I had a 2.5 in my plymouth sundance the thing will run forever it had also 250k on it used 10w-30 all its life for the time that i had it with no leaks and it is still driving around

 

[QUOTE=The Rooster;850375]Stick with 10-30 it has ran with no leaks for 128k then stick with it... don't mess with whats not broke... and use regular oil.. if you switch it will leak like a broken dam...

No it wont.