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Username Post: 08 Denali        (Topic#348894)
Posts: 20

Reg: 07-10-08
12-28-17 03:33 PM - Post#2719250    

Picked up a 08 Denali xl really like the truck, but found a issue with the wheels and corrosion. Got a tire psi warning so I removed and checked it for a nail or something, nada , aired up and sprayed with soap found leaks around the bead area due to peeling chrome . My question is can a product like fix a flat or slime be used in these tires ?
I dont know how the tire monitor system works.
Also would it be wise to run Mobil1 synthetic in this 6.2L with 117K miles??

Senior Moderator
Posts: 28817
Age: 48
Loc: Texas
Reg: 08-01-03
12-28-17 04:26 PM - Post#2719260    
    In response to scotty40

Fix-a-flat, Slime, anything you put in through the valve stem will ruin your TPMS sensor, so don't do it!

Any good tire shop should have bead sealant on hand. It's black, goopy stuff they can smear around the bead. It's a little bit hit or miss, but I did have good luck with them using it on a whole set of chromed wheels that were leaking at the bead.

Don't see any issues with using synthetic oil! Just be sure to stick to the grade recommended by GM and use a good filter. I'm using Mobil1 oil and their filters as well. They may list an alternate filter for your engine that allows for a little more capacity. That's a win/win as you get more oil capacity plus more filter media. For my 2006 Silverado SS with the 6.0, the larger filter is the M1-206, vs. the smaller M1-107 normally specified. Your 6.2 may use different ones.


06 Silverado ISS / 06 Silverado SS / 06 300C SRT8

"2nd Year" Silver Supporting Member
Posts: 110
Loc: Portland, OR
Reg: 04-16-13
12-29-17 08:14 PM - Post#2719381    
    In response to scotty40

I agree with Scotty, you can't go wrong with Mobil One. As he recommend, use the factory recommended viscosity. I have been using Mobil One high mileage oil in my 62 327 Impala with 98000 original miles for 5 years now with no problem.


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