Originally Posted by J.Ro

As for changing over to synthetic. I was told and also go buy if you do not go over at the start (first few oil changes) it's not worth it. The motor has been broken in and the tolerances have been gapped by the regular oil so synthetic will just no be any use and provide even less protection since it is thinner at all temps. Also as for Royal Purple. A friend of mine changed all his cars/trucks to it and the ones that had over 50K all had engine noise/ticking. The only one that sounded good on Royal was the new 300C with 20K on it. He then went back to good old MaxLife in his others. I also went to sythetic in my old 02 Ecsalade at the time when it had 60K and I ended up with noise and dry starts if it sat for more than 1 day, back to Maxlife in that on. Just my experience and thoughts take it with a grain of sale if you like.

I went to Mobil 5w20 at 3000km=1800miles in the JK it sounds good/starts nice. But I do buy my oil in the US since 5l jug of Mobile here in Canada'07 is 42+tx=$48. When I go down I stock up at $23 a jug.