Too old for synthetics?
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Senior User
Joined: Jul 2008
Posts: 212
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Too old for synthetics?
2003 7.3 w/ 140K on the clock.
New to me, but is it too old for synthetics in the motor?
I guess I wonder if it could start leaks where there weren't any before.
I am going to have a blackstone done on it (although since I bought it the horse is pretty much out of the barn) when I change the oil soon (this time I'll just use factory spec weight, non synth)
What are you all running, I used to run S9000 in my 5.9 dodge, but it did make it a little stinkier out the pipe.
Let me know your thoughts.
Thanks.
New to me, but is it too old for synthetics in the motor?
I guess I wonder if it could start leaks where there weren't any before.
I am going to have a blackstone done on it (although since I bought it the horse is pretty much out of the barn) when I change the oil soon (this time I'll just use factory spec weight, non synth)
What are you all running, I used to run S9000 in my 5.9 dodge, but it did make it a little stinkier out the pipe.
Let me know your thoughts.
Thanks.
Fleet Mechanic
Joined: Sep 2002
Posts: 1,388
Likes: 2
From: Greensboro, NC
Definitely switch to synthetics! They wont cause any additional oil consumption and your engine will benefit from a higher quality oil. Amsoil makes a great 15w40 which can give you extended drain intervals as well if you keep up on the oil analysis. I know a few guys who are running 15k-20k on an oil change but that includes a filter every 5k, take a sample and top off the oil level. I personally wouldn't go that long even with the analysis but it's hard to argue with them - one has over 340k miles on his 7.3 and another has almost 250k - neither with any engine issues both running Amsoil.
Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
Old wives tale again. Synthetic or regular oil is pretty dumb. If you have a leak, you have a leak. If you use lighter weight oil it can leak. After all, some people use heavier weight oil to "cure" a low oil pressure situation.
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