What weight of oil does a 1999 Chevy Tahoe take?
That depends on weather and driving conditions. I would contact GM dealer in my area or take a look at the manual. I live in Texas and I try to run 10w40 in the summer and 10w30 in the winter. Some may disagree but my Chevy logs 160,000 miles and the GMC has 250,00 miles on it. I also hear great things about synthetic oil but I have never used it. Hope this helps.
