: motor oil

01-15-08, 04:19 PM
I put in 10w-30 Castrol, that was my first oil change. Times coming for a new one. Any recommendations? I heard that it isnt good going to use synthetic if conventional was used before /vice versa. I was considering synthetic, don't really know the advantages I would have but, maybe youse can chime in.

01-15-08, 05:45 PM
Thats not always true and there are many myths about oil but a synthetic oil is better hands down i use penzoil platinum 10w30 Mobil 1 is also good and Mobil 1 high mileage Full Syntheticis good too Royal purple is suposed to be the best but at 7 dollars+ a quart its your call Even the walmart Super Tech full synthetic is made by a good oil company if im not mistaken Mobil 1 or penzoil Stick with a synthetic and change 3-5 thousand miles

heres an old thread that may be of some use to you if you have not seen it http://www.cadillacforums.com/forums/cadillac-catera-cimarron-forum/89081-preventative-maintenance-add-your-tips.html