Hi everybody, I’m selling my 2017 L5P duramax to get out of a payment and found a 2004 GMC LB7 duramax for sale with 53,000 miles on it. I’m not the most mechanically inclined person when it comes to motors. Any helpful tips or things to look for when I test drive it. And look at it in person?! Was told it has been stored indoors when not driven. And for the last 10-12 years has been driven 3,000 miles a year or so. Any help appreciated! Thanks.