I have a GMC Sonoma 1991 4x2 4.3L, V6. I changed the engine few years ago, but "new" engine has 120000 miles already. Is working fine, I take good care of it. My question is: What kind of oil should I use in this high mileage engine? I have been using 10-40 all the time but wonder if I should change to another oil. Can I use synthetic or do you think it's not recomended in this old car? I live in Florida, hot weather. Thank you very much for your help.
have the same problem?
Sunday, November 22nd, 2009 AT 11:09 AM