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Engine/Transmission (1998.5 - 2002) Syn oil and break-in

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2nd Gen Non-Engine/Transmission Gauges bouncing

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Well, reading some other threads on break-in and synthetic conversion got me thinking. Yeah, I am dangerous when I do that (ask Champane flight).



Why not break in this way: With each succeding oil change, add more synthetic oil. For example, change at 3K, and use 2 qt of syn. 6k, step up to a gallon of syn.



Eventually, you would have all synthetic in the case by 25K miles or so.



Here's the reasoning: we are trying to polish the internal engine parts by progressively reducing friction. It's like when you are doing body work. You might start with a 60 grit, then a 150 grit, then maybe a 300... on and on until you are color (wet) sanding. Each is a reduction in friction over the step before it.



It seems to make sense to me, but usually that means I am overlooking something obvious.



On the other hand, guys like amsoilman switched over whole hog as early as 8K, and didn't have any probs at all.



Anyone care to comment on this. Feel free to point out the error of my ways. God knows it's not my first, and certainly won't be the last.



Hohn
 
There is no harm in mixing mineral oils an dsynthetics. Hell, virtually every major oil manufacturer offers a "blend" to cut cost. But you also reduce performance.



Why would you want to mix oils? Would you put one quart of say, Valvoline, Mobil, Exxon, Shell, and Chevron in an engine? Okay, sure, if it was all you had but would you do it on purpose? Probably not.



Here's the reason not to mix... ... no advantage to what you are proposing and second, if something strange did occur, such as the oils not liking each other and doing something funny such as foaming for instance, then who are you going to go to for assistance? The mineral oil supplier is going to say it wasn't his oil? The synthetic oil supplier is going to say it wasn't entirely his oil. You're on your own if you do this.



Believe me, the oil manufacutere's acna analyze the oil and tell if it is 100% their formulation.



Run your engine on two oil drains of mineral oil, say Chevron Delo or Shell Rotella 15W40 changing at 5K and 10K and then switch 100% to the synthetic and be done with it.





315K and 10 years of synthetic experience in Cummins - JMHO



Oo. Oo.
 
Best advice i have had in a while

I like the two-drain idea. Your point about mixing oils are all valid, so I think I will stay wiht the Rotella for now. Thanks.



315K on syn oil-- that thing's probably still within new specs!!
 
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