# Passing smog visual test **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, silverado2500\ **Created:** [November 5, 2011, 6:19pm UTC](https://community.cartalk.com/t/passing-smog-visual-test/69234 "2011-11-05T18:19:19Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![braindead](https://avatars.discourse-cdn.com/v4/letter/b/6f9a4e/32.png) [@braindead](https://community.cartalk.com/u/braindead)\ **Post date:** [November 5, 2011, 6:19pm UTC](https://community.cartalk.com/t/passing-smog-visual-test/69234/1 "2011-11-05T18:19:19Z")
I heard that if you use two cycle smokless oil in your motor that your vehicle will pass does this work or do you know any info will be helpfull thanks ---
**Author:** ![keith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/keith/32/5518_2.png) [@keith](https://community.cartalk.com/u/keith)\ **Post date:** [November 5, 2011, 6:20pm UTC](https://community.cartalk.com/t/passing-smog-visual-test/69234/2 "2011-11-05T18:20:38Z")
Is anybody screening these posts. lol ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [November 6, 2011, 12:19am UTC](https://community.cartalk.com/t/passing-smog-visual-test/69234/3 "2011-11-06T00:19:57Z")
Yes, it does work! Any synthetic oil works pretty good but synthetic 2-stroke oil works best…The drawback is 4 quarts of that stuff will be expensive and you don’t want to leave it in very long…Another problem is most 2-stroke lubes are “pre-diluted” so they mix readily with gasoline. Too thin for that old Chevy truck…Motorcycle shops will have some trick stuff at even MORE outrageous prices…Try 4 quarts of Mobil 1 and do a smoke test in your own driveway first…Or bite the bullet and scrap the truck…For $1500 you can buy a 2500 that does not smoke…