Is that about right?
I need to do the oil in my jeep 4.0
It takes 6 quarts to fill.
I have 4 quarts of 5-30, 1 quart of 5-20 and 1 Qt of 10-40. going to the store for 2 more quarts of 5-30 is not possible.
Also how much LESS oil will it take to fill the 4.0 if I leave the old oil filter on? ( as I do not have a new filter right now and like I said going to the store not possible, and the filter is a mobil 1 with about 4500 miles on it).
1 Qt 10-40 plus 1 Qt 5-20 equals 2 Qts 10-30 ?????
- Thread starter RegDunlop
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I'd put in 5.5 quarts and see where that gets you. without filter. The good thing is, it's a Jeep 4.0, so it will probably leak out any excess rather quickly.
Unless we know the CST values of each oil, it's hard to guess on a blend. And even then, to know for sure, it would have to be actually tested to know.
With that said , I don't think your random blend of 5w-30/ 5w-20 /10w-40 is going to hurt a Jeep 4.0. I've run everything from 5w-20 , 10w-30 to 5w-40 in mine without issue.
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I know someone had posted a link to a thing that would give you a cST of mixing different oils, but without knowing the exact cST of the oils your using, no way to tell for sure.
Regardless, for the 4.0, it would be fine.
I know the FL1A size filter is almost a qt, I would add 5 qts and go from there.
Originally Posted By: RegDunlop
... Also how much LESS oil will it take to fill the 4.0 if I leave the old oil filter on? ...
My '98 XJ 4.0 in my sig takes 6 quarts with the PH8A sized filter, roughly 5 when I don't change the filter (which is 2 out of 3 times because I run a Fram Ultra XG8A).
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And 1 qt. 5W20 & 1 qt. 10W40=7.5W30. Or, WAY TOO THIN for your average 4.0 (mine likes either 10W40 or 15W40 HDEO). 
Originally Posted By: CT8
1 Qt 10-40 plus 1 Qt 5-20 equals 1 Qt 10-40 plus 1 Qt 5-20 .
Good enough
Originally Posted By: CT8
1 Qt 10-40 plus 1 Qt 5-20 equals 1 Qt 10-40 plus 1 Qt 5-20 .
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