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Unread 07-24-2006, 08:33 AM   #1
redcj576
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type of oil

hi,
what type of engine oil should i use for my (1979 )305. chevy powered cj7?


thanks

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Unread 07-24-2006, 09:26 AM   #2
jlynch
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That's a personal preference. I use valvoline 10w 30
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Unread 07-24-2006, 09:58 AM   #3
BESRK
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Probably your favorite 10w30 or 10w40.... I just use whatever's cheapest since it gets pumped out of the engine almost as fast as I pour it in.
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Unread 07-24-2006, 02:11 PM   #4
86cj74.2L
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I use 15w40 diesel oil in the summer and a blend of 15w40 and a synthetic 5w40 diesel oil in the winter.
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Unread 07-24-2006, 02:17 PM   #5
KrazyGimp
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Quote:
Originally Posted by 86cj74.2L
I use 15w40 diesel oil in the summer and a blend of 15w40 and a synthetic 5w40 diesel oil in the winter.
You mix regular and synthetic oil? Or did I just read it wrong?
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Quote:
Originally Posted by BESRK
...that's why you push in that little nipple (hehe.. I said nipple on the internet :D )
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Unread 07-24-2006, 02:41 PM   #6
86cj74.2L
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Yes, I mix it in the winter 50/50.

I end up with a 10w40 semi-synthetic with all the benefits of the diesel oil additive package. They are compatible when mixed together.

I use shells Rotella 15w40 and synthetic 5w40 for my winter mix and the fleet oil our work uses and I get at 4.50 a gallon in the warmer months. (I change seasonally) I also use the larger oil filter.
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Unread 07-24-2006, 02:47 PM   #7
KrazyGimp
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So you can mix synthetic with diesel oil and it will work? I was always under the impression that once you put synthetic in a motor you could only run synthetic from then on. Something about additives in the synthetic oil actually repelling normal oil and causing wear on parts. Is this just misinformation or is there any truth to it?
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Quote:
Originally Posted by BESRK
...that's why you push in that little nipple (hehe.. I said nipple on the internet :D )
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Unread 07-24-2006, 03:07 PM   #8
86cj74.2L
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On the bottle it will say compatible with synthetic and conventional motor oils. It may just say all motor oils.

When our fleet oil guy came in and I told him I was using Shells 5w40 synthetic he got pissed because he hates Shells mas marketing approach on a what he calls a genetic not so great oil product.

Anyway he told me to mix 1 gallon of his oil to 2 gallons of the Rotella so I get the benefits of his additive package and the lower pour point of the synthetic. ( he wishes they had a synthetic oil product but most fleets always have their trucks plugged in and my area doesn't fall under the 5w30 or 5w40 synthetic oil in winter time I.E. temps in the single digits. We may get 2 to 5 of those nights during the whole winter.
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Unread 07-24-2006, 03:13 PM   #9
BLS33
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Quote:
Originally Posted by BESRK
I just use whatever's cheapest since it gets pumped out of the engine almost as fast as I pour it in.

I second that
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