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Discussion Starter #1 (Edited)
Hi all,

A few months back I purchased a used 2007 Commander. I have an oil question. The Jeep has a 4.7L Flexfuel V8 and from what I can tell I should use 5w-30 or 10w-30 in the summer months (this seems debatable but some of the XJ guys I was talking to about this suggested it). However, the oil cap has 5w-20 stamped on it and this has lead to my confusion. I know the 5.7L HEMI requires 5w-20 but would running this in a 4.7L be bad for the motor? I'm assuming what probably happened is the dealer put the wrong cap on her when doing an oil change. They couldn't handle putting the correct manual in the glove box or fixing a simple brake issue (had to fix it myself) so I've lost confidence in them.

Anyway, if the previous owner was running 5w-20, should I worry about there being any long term issue? Should I run 5w-20? Should I go with 5w-30? Does it not really matter?

Thanks!
 

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From the owners manual for 2006 Best to check a manual for 2007- probably wrong cap. Probably would not hurt to use 5-20 especially if you live in the north. Would not worry about any damage. Why don't they put that on the dipstick? a long time ago they did.
Engine Oil Viscosity (3.7L and 4.7L Engines)
SAE 5W-30 engine oil is recommended for all operating
temperatures. This engine oil improves low temperature
starting and vehicle fuel economy. Your engine oil
filler cap also shows the recommended engine oil viscosity for your vehicle.
 

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From the 2007 Owner's Manual:

Engine Oil Selection
For best performance and maximum protection for all
engines under all types of operating conditions, the
manufacturer recommends engine oils that are API Certified
and meet the requirements of DaimlerChrysler
Material Standard MS-6395. Use Mopar or an equivalent
oil meeting the specification MS-6395.

American Petroleum Institute (API) Engine Oil
Identification Symbol
This symbol means that the oil has
been certified by the American
Petroleum Institute (API). The
manufacturer only recommends
API Certified engine oils that
meet the requirements of
DaimlerChrysler Material Standard
MS-6395. Use Mopar or an
equivalent oil meeting the specification
MS-6395.

Engine Oil Viscosity (3.7L/4.7L/5.7L Engines)
SAE 5W-20 engine oil is recommended for all operating
temperatures. This engine oil improves low temperature
starting and vehicle fuel economy. Your engine oil
filler cap also shows the recommended engine oil
viscosity for your vehicle.

For information on engine oil filler cap location, see the
Engine Compartment illustration in this section.

Lubricants which do not have both, the engine oil certification
mark and the correct SAE viscosity grade number
should not be used.

Synthetic Engine Oils
You may use synthetic engine oils provided the recommended
oil quality requirements are met, and the recommended
maintenance intervals for oil and filter changes
are followed.

Materials Added to Engine Oils
The manufacturer strongly recommends against the addition
of any additives (other than leak detection dyes) to
engine oil. Engine oil is an engineered product and it’s
performance may be impaired by supplemental additives.
 

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I own a 2007 4.7 liter flex fuel and it take 5w20. Just a heads up you have the correct oil cap. Oh and don't run any other oil other than 5w20 or else you will have issues. Our engines need the thinner oil. And stop taking advice from someone who doesn't even own a commander
 

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Discussion Starter #5
thanks for the responses. i did put 5w-30 in the last time i changed it but i'll be sure to put 5w-20 this time.
 
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