Posted by RodInNS on September 04, 2014 at 10:56:37 from (216.118.158.123):
In Reply to: mixing oils posted by Edd in KY on September 03, 2014 at 19:10:36:
Generally I would just go ahead and use it. I assume you're talking about an older tractor that was probably spec'd to use straight 30 anyhow... which is probably what you ought to be using anyway or at least a 15W40. Now if you're talking about a newer engine, particularly the jap engines that have quite tight tolerances.. then yeah, I'd mix a quart of 30 but probably not a lot more. Those things are often spec'd for a 10 weight oil and if you run a full 30 in them you may end up starving parts of the engine from lubrication... The way I look at it, adding 1 qt of 30 to 7 qt of 10 is not going to change the base number a whole lot but adding 5 qt on an 8 qt fill IS going to change it a lot and that could cause a problem on some engines. All this other worry about mixing brands, etc.... would not concern me for 1 qt for one day or even the duration of this change period.
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