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Originally Posted by stevew092984
Sorry if I sound uneducated when it comes to mechanics, but how would I check if there’s burning oil or coolant in the combustion chamber?
Got the truck back from the mechanic and I asked him how I can avoid this happening again and he told me it could be a number of things. He then asked what gasoline I used and I said I use Costco exclusively to fill up. He then told me that’s my problem right there. Said 8 out 10 people who go to his shop for emission problems are using Costco’s gasoline. I’m not too sure how I feel about that. Any thoughts?
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An easy way is to monitor your oil and coolant levels to see if/how quickly they're dropping. Smoke coming out the exhaust is another tell tale sign, but not always present. You can check your spark plugs to see if they have any buildup or anything, or even look at your cylinders with a boroscope to check for excessive buildup. Compression test/leakdown test might be the only surefire way to check, there are writeups on how to do that on the forum. There are probably other ways that other forum members might be able to chime in about.
I can't speak to costco gas, I haven't heard of any problems with it but I suppose it could be an option. As far as gas, I think any modern gas from a reputable company (chevron, 76, arco, sinclair) should be fine, as gas these days is so much better than it was 20 years ago. I've always used arco gas and haven't had any issues, though I have had the P0420 code for my entire ownership of the car.