My wife has a 2006 Jeep Liberty Diesel that the owners manual calls for either 0w-40 or 5w-40. I was able to get a 15w-40 oil which has more zinc in it than regular shelf oils and I would like to use this (I have had good luck with this brand in my car racing applications). Would using the 15w-40 oil have any adverse effects on the engine?
Thanks in advance
Thanks in advance