im using 5w-30 valvoline dino oil which seems to go well with my car and wallet...but i was wondering, im at 112,500 miles and i was wondering if switching to synthetic oil will be a better idea. i do some highway driving, i get on it every now and then, cross town driving, winters are 50 degrees and down, summers are 80 and up (very muggy) so i am asking should i stick to dino oil or switch to synthetic, (i dont mind the extra cost, just wanting the better for my car)

In my 99 2.8 Q I first used regular castrol 10w30 for 1st oil change. After I always used synthetic 10w40 (the purple sh$t). My car just feels healthier when I run it and the cost isn't too bad (my mechanic links me up at cost price). Other wise your looking at about $45 cdn for 4L.