ENGINE OIL WITH FULL SYNTHETIC?

Question

WHAT TYPE OF FULL SYNTHETIC OIL SHOULD I PLACE IN MY 2003 4X4 CHEVEY SUBURBAN NOW THAT IT HAS 85000 MILES ON IT 10-30 OR 10-40

Answer 1

http://www.valvoline.com/pages/products/...

Answer 2

I would go with the 10w-30 and you will be fine putting synthetic in as long as the truck doesn't burn any oil or have any leaks.

Answer 3

With 85,000 miles I think that it is a bit late for synthetic oil.  Shoulda been done at the start.  If you are in doubt, ask a reputable lube shop or mechanic.

Answer 4

1030 will do just fine unless you are going through more than a quart every 3000 miles. if this is happening, try the 1040.