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jewel  jewel is offline
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'The oil I used in my WK2 was Nulon full synthetic Diesel Long Life engine oil, Now I have a KL Trailhawk I looked at using Nulon Full Synthetic 5w-20 FuelSaver,however the Nulon website has a note suggesting that this oil be used after the warranty expires as the formulation must not meet Jeep specs, I am nervous about using the Nulon oil in case I have engine problems in the future. I would appreciate any thoughts on this and also any recommendations on oil brands.

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You should use a oil that at least meets or exceeds the specification classification as listed in the owners manual. Look for the manufacturers recommended SAE and API classifications and have a look on the oil packages and compare those specs.
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Nulon 5W20 may have friction additive and doesn't meet Chrysler MS-6395?

I'm not sure about the diesel KL but for the 3.2L V6, MS-6395 spec is called up. I'm using Nulon 5W-30 Long Life full synthetic which is definitely listed as meeting Chrysler MS-6395
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jewel  jewel is offline
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Trailfirst, I see that you are using 5w-30 which is different from the 5w-20 spec, is there any special reason?, it meets the Chrysler MS-6395 but is the incorrect grade according to Jeep.
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Hi jewel - to make sure the engine definitely ran in properly I had intended to use 5W-30 mineral oil that met chrysler spec MS-6395 (in spite of modern tech and everything I just couldn't bring myself to trust 5W-20 mineral) - but in the end I went straight to 5W-30 full synthetic - ie. Penrite Enviro+GF-5. Keep in mind I'm a 30year experience Licenced Aircraft Maintenance Engineer.

In the scheme of things 5W-30 isn't really "incorrect" as such - it's just not ideal. The owner's manual says it's ok to use 5W-30 if 5W-20 isn't available - which I take to mean that the reason for them even using 5W-20 in the first place probably isn't anything terribly critical - most likely it's to do with being able to achieve absolutely optimum fuel efficiency? The really critical issue for warranty is that it's within specifications - including meeting MS-6395.

Pretty much in line with looking into if / why 5W-20 REALLY needed to be used I discovered that lots of people including dealer and non dealer mechanical shops and individuals both here and in the states have been using 5W-30 for years in Pentastar engines across the chrysler / dodge / jeep range of vehicles.

On top of that, some reading up on the ins and outs of modern low viscosity oils - both synthetic and mineral - indicated that slightly heavier oil does have advantages for long term wear even if it's minute. Further to that - altho I have no idea whether it's actually related to wear characteristics - I noted with interest how Nulon's 5W-20 has Moly Dithio added - where they don't seem to feel compelled to do the same with 5W-30... (if I HAD to use a 5W-20 I'd use that Nulon one regardless of not technically meeting MS-6395)

I was ok with going to full synthetic 5W-30 from the second oil change onward is because even in 5W-30 I just don't feel confident in mineral oil holding up - especially in the tropics.

Interestingly enough, when we had that first service done it was by an accredited but non dealer mechanical shop (no dealer in our location at that time) - so I supplied them a factory oil filter and Penrite 5W-30 Enviro+ oil for the job (that first 6 month service is otherwise just visual checks). When I was dropping off the car and handed over the filter and oil, the guy looked at me with a wry grin and indicated over his shoulder at a bunch of 200L drums in their "oil bay" a couple of meters behind him. The drums were Penrite 5W-30 exactly the same as the bottle I was handing over... (edit: I remember now being surprised and impressed that they were using a synthetic as their bulk supply)

Oh - an edit I had to make to my other post was to fix a mistake i made with what Nulon oil I'm using now - I'm using Nulon 5W-30 Long Life Full Synthetic from the most recent (24mth) oil change a couple of months ago but before that I used Penrite 5W-30 Enviro+ synthetic for the FIRST (6mth), SECOND (12mth) and THIRD (18mth) oil changes.

After researching reviews etc. I decided the Nulon synthetic was the way to go.

Sorry about the lengthy post and chopping and changing - gettin old and all that crap (redface).

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Trailfast, thanks for your post, I like Nulon; I think I will look at The Nulon synthetic 5w-30 on my second oil change which is due early July.
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Any specified oil will be more than adequate, I'd be looking for what's on special as it is the dealer servicess mine.
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The reason manufacturers spec 5W-20 and similar light oil in modern engines is to achieve fuel economy and emission targets.
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Quote:
Originally Posted by Trailfirst View Post
I used PENNZOIL 5W-30 Enviro+ synthetic for the SECOND (12mth) and THIRD (18mth) oil changes.
Are you sure it was PENNZOIL not PENRITE?
http://www.penriteoil.com.au/products/brands/enviro+/

I have used Penrite's tech support service and they are very helpful, worth the time to call or online chat.
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