Oil recomendations
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Oil recomendations
So I just bought a 79 Bronco with a 351M from a guy on here. Looks like he took very good care of it. I was wondering what kind of oil I should run with (I think)160K miles on it.
Laughing Gas
Joined: Dec 2000
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From: East Texas
Originally Posted by Ranger1F150
Diesel oil in a 351M gas ?
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Laughing Gas
Joined: Dec 2000
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From: East Texas
For sure. The reman engine needs those additives in the diesel oil for cam break in. I use it in my engine that was rebuilt last year. I'm using Rotella 10W-30. Only problem, that weight is a little hard to find in my local area.
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Postmaster
Joined: Jul 2001
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From: MD
If it has the flat tappet cams, your best bet is run with this additive:
http://www.gmpartsdirect.com/results...number=1052367
http://www.gmpartsdirect.com/results...number=1052367
Posting Guru
Joined: Aug 2005
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From: Coal Country, ND
I think you guys have convinced me to switch. I can get a good deal on 15w40 form work anyway (truck shop). My only concern is starting in the winter? Does the higher viscosity make much of a difference?
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From: MD
Originally Posted by Torque1st
The additives in diesel oil reduce wear on the cam and lifters even after break in.
Laughing Gas
Joined: Dec 2000
Posts: 781
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From: East Texas
I was concerned as well about the new CJ-4 rated diesel oils. So concerned in fact that I sent an email to AskShell for info on the new rating (reply from Shell is in a thread in the Oil and Lube Forum entitled "FYI For Those of Us With Flat Tappet Cams"). Essentially, the Shell engineer stated that the CJ-4 rated oils still had 50% more zinc etc. than SM rated gas oils.
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