Ok, looking to switch to full synthetic in my 7.3. Any preferences? Suggestions?
ExactlyWhat a joke.....
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This is just like the gun lube threads I see on my other forum. No consensus, no convincing and everybody has the magic formula.
As for me, I'm not sure it matters much. Never found any tangible benefits to either. Cost is definitely a drawback to synthetics though. Some engines require it because they run so hot. If they don't require it then I usually recommend just synthetic blends or conventional.
Your truck, run whatever blows your hair back.
the funny thing about my 02 is it does not leak any oil with conventional 15-40 valvoline all fleet.
but put synthetic in it and it will leak a quart every 250 miles.
the 2004 5.4 is the same way, still on the full mark at 5000 mile oil change, but put synthetic in it and it needs a quart every 4-500 miles.
i would not even think of trying synthetic in any of the other trucks or cars.
Care to provide some objective evidence? I ran full synthetic on my 315,000 mile 7.3 for a couple years and never had an issue.Regardless, i work on these 7.3s and 5.9s on a regular basis. 15w40 conventional is what is recommended from the factory, or 10w30 diesel. I also know the heui system doesnt like it as well as the conventional. Not going to say all diesels cant run on it just dont use it in a 7 3. We use valvoline 1540 and motocraft 1030 for the 6.7s and 6.4s you can use whatever you want im sure it wont hurt the internals. There is a reason the manufacturer specified these oils