engine oil

stefanoquinto · Jan 30, 2018

what type of motor oil need my 4.0 renix? 5w30... 4w40... 10w40...

yhe haynes book tell 5w30 or 10w30, right choice?
thanks

Wayne Sihler · Jan 30, 2018

10w-30 is the oil to use.You have a truck engine,Not a sewing machine....

JeepNoob · Jan 30, 2018

Yes, 10W30. 5W30 is for colder climates or times of the year. (For example, if you expect temperatures to drop below freezing and not get above say 50 or 60 F/10 or 15 C)

stefanoquinto · Jan 31, 2018

Very hard to find 10w30 (italy...strange place...).
Where I leave isn't so cold, is better 5w30 or 10w40 (both available) fully synthetic obviously &#55357;&#56842;

stefanoquinto · Jan 31, 2018

but I can Use fully synthetic oil on this engine???
is better wahing the system before?

Tim_MN · Jan 31, 2018

5w-30 or 10w-40 is OK. If temperatures are higher, use 10w-40. Synthetic is not necessary for such an old engine as the Cherokee has may not provide any benefits to justify the extra cost.

My 1998 has 280,000+ miles and most of those miles used regular non-synthetic oil.

stefanoquinto · Jan 31, 2018

Thanks for reply

alexgalexg · Feb 7, 2018

I would agree with jeep noob on this. But if highly recommend synthetic. Synthetic goes where other oils don't and does a better job at lubricating. Regular oil won't harm the engine but you can only benefit with less wear.

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Tim_MN · Feb 7, 2018

alexgalexg said:
Synthetic goes where other oils don't ...

Mostly on the garage floor is where it goes.

High mileage engines tend to leak synthetic oils at a faster rate than organic oils. Not to mention, the Jeep 4.0L is based upon a 1960's design and will last many hundreds of thousands of miles with standard organic engine oils, thus the extra cost of synthetic oil really provides no additional benefits in relation to the extra costs. The one exception for synthetic oils is in extreme below freezing cold weather, a synthetic or semi synthetic oil will aid in starting, and cold lubrication.

stefanoquinto · Feb 11, 2018

in the end, thanks to you, I have chosen a good quality semi-synthetic oil 10w40.
Tim_MN's considerations were the same as my mechanic did exactly the same seasonings.

engine oil

stefanoquinto

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