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16/01/2024 11:16 am
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Hey Scotty,
I have a 2019 RAM 1500 Classic with the 5.7L Hemi V8 with 68,000 Miles. It has recently gotten very cold outside and I noticed upon cold start there was a puff of blue smoke out of the tailpipe for a second or so when the truck first started then went away. This has never happened before I was thinking this is possibly a sign on the piston rings starting to wear. What are your thoughts/suggestions on what could be causing this?
Thanks.
Kevin
1 Answer
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16/01/2024 1:41 pm
White smoke on startup is condensation, so blue is most likely oil. When your catalytic converter heats up, it burns the oil, so there's no blue smoke then. Are you using oil between oil changes?
Fortunately, there's a pretty cheap and easy test to see the condition of your rings and pistons - do a compression check dry, then put in an ounce of oil and do the compression test then. If there is substantial difference, you have worn rings.
Here's Scotty demonstrating it
Oh, and while you're in there, replace you PCV valve, as a clogged one will increase oil burning.
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