4.0L oil switch

JeepSD

New member
I just purchased a 2005 Wrangler X and it has 68K miles and has been running on 10W 30 non synthetic. If I want to switch it over to Mobil 1 synthetic oil will that effect the engine?
 

No, that will be fine.
However....since I am also on the BobIsTheOilGuy.com forum where oil and used oil analysis results are discussed ad infinitum....Jeep I-4 and I-6 engines tend to throw off a lot of iron wear (in parts per million, PPM, which is not a huge deal). Mobil 1 itself tends to show higher iron PPM in most engines, again it's not BAD just higher than some other oils. Therefore....in a Jeep I would use Mobil 1 High Mileage which has a little more zinc in it or Pennzoil Platinum Synthetic, with which I have gotten better used oil analysis in every vehicle where I have compared it with plain Mobil 1 plus it's usually a little bit cheaper.
 
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