changed oil to syn and now a knock
Thread Starter
CF Beginner
Joined: Jun 2010
Posts: 3
Likes: 0
ok i just started it and its a ticking noise not a knocking noise but it does go away after it warms up and it just started when i had the oil changed to a syn, not sure if its that i changed to syn or if something happened at the shop and they didnt tell me so im still looking lol
CF Active Member
Joined: May 2009
Posts: 207
Likes: 0
Oddly enough, changing to syn oil made my oil tick/knock louder. Mine was the result of 3 pistons that had worn through the skirting. I'm not sure why syn made the knock more obvious.
I'm not rolling around with a new 5.3 courtesy of GM.
I'm not rolling around with a new 5.3 courtesy of GM.
CF Beginner
Joined: May 2010
Posts: 5
Likes: 0
From: SW Virginia
My 02 2500 hd 6 liter has that same noise and I have used both synthetic and conventional oil. 70,000 miles
My neighbor has a 00 2500 6 liter and his engine has the same noise, 150,000 miles.
Sorry I don't have an answer, just know that it may be the nature of the beast.
My neighbor has a 00 2500 6 liter and his engine has the same noise, 150,000 miles.
Sorry I don't have an answer, just know that it may be the nature of the beast.
Trending Topics
CF Active Member
Joined: Feb 2008
Posts: 121
Likes: 0
different engine but same problem.
350 developed a tic, i changed oil, I use 10w30 valvoline, wix filter and added 1 qt of lucas oil stabilizer. Tic when away.
might try draining the synthetic oil and trying this oil combination.
it worked for me, but then i have never used synthetic oil in my engine 90K
no question to me that synthetic has better lube properties than dino oil, but sometimes it can develop other problems since the molecules are smaller.
why did you decide to change to synthetic oil????
350 developed a tic, i changed oil, I use 10w30 valvoline, wix filter and added 1 qt of lucas oil stabilizer. Tic when away.
might try draining the synthetic oil and trying this oil combination.
it worked for me, but then i have never used synthetic oil in my engine 90K
no question to me that synthetic has better lube properties than dino oil, but sometimes it can develop other problems since the molecules are smaller.
why did you decide to change to synthetic oil????
Super Moderator
Professional Mechanic
Professional Mechanic
Joined: Nov 2008
Posts: 2,950
Likes: 5
From: Bowie, MD
Did they use the proper weight? Sounds like a lifter tap. Find a shop that has the newest BG (www.bgfindashop.com) oil flush machine. 90% of the time it will stop a lifter tap and or stop a engine from burning oil, also it is a good maintenance service.
