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Unread 08-24-2008, 10:09 PM   #1
Clem82389
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Location: sc
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What oil grade should I use?

I have a 1982 CJ7 258 with 125,000 miles. Slight oil leak around the head and oil pan. Oil pressure is 55 when I crank it and 25 when it gets hot. No knocks. What oil grade should I use. I live in sunny SC.

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Unread 08-24-2008, 10:20 PM   #2
DirtEater
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I had slight oil leak, and a mechanic that I trust recommended Rotella 15W40 for old motors, and I kind of took his advice. I have 145K, and I changed the oil with Delo 15W40, and you know what? He was right. I barely get a small drop of oil once in awhile. Sure, some smartypants here will say something like "there's no such thing as a mechanic in a bottle". But all I can say is, the 15W40 is working out fine in my '82 CJ7 258 and I'll likely continue using it.
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1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion
Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's
33" Toyo M/T's on Pro Comp Xtreme Series 1069
Borla header and Catback Exhaust System
Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper
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Unread 08-24-2008, 10:22 PM   #3
DirtEater
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Oh, and be sure to snug the oil pan bolts.
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Terry ~ USN Ret. 30Sep07 : )
1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion
Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's
33" Toyo M/T's on Pro Comp Xtreme Series 1069
Borla header and Catback Exhaust System
Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper
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Unread 08-24-2008, 10:29 PM   #4
Clem82389
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thanks for the quick reply. I'll try it.
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Unread 08-24-2008, 10:32 PM   #5
DirtEater
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If you decide on the Delo, you can get it at ChinaMart for about $10 gal. The oil change is 6 qts total. I bought 2 gallons and have 2 quarts left over for next change.
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Terry ~ USN Ret. 30Sep07 : )
1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion
Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's
33" Toyo M/T's on Pro Comp Xtreme Series 1069
Borla header and Catback Exhaust System
Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper
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Unread 08-24-2008, 10:34 PM   #6
SuB8HaVeN
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Snug the bolts, don't get them too tight or you will pinch the cork gasket and it will be leaking a LOT more. I think those bolts are only supposed to be torqued down to 10ft-lb, someone correct me if I'm wrong. It may be your rear main seal leaking and could also (probably) be the back of your valve cover leaking. Same thing with the valve cover, if you tighten too much it will pinch the cork gasket and leak rivers.

I run Penzoil Long-Life 15W-40 diesel oil. I would recommend running either the Rotella as mentioned above or the Penzoil Long-Life.
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1961 Willys 4x4 Wagon L-226 I6 T90 (restoration also in progress)
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Unread 08-24-2008, 10:39 PM   #7
DirtEater
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Why not Delo? Not near as stinky as Rotella. That is THE smelliest oil I tried in my Dodge/Cummins HD. It's nickname of Rosmella is fitting.
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Terry ~ USN Ret. 30Sep07 : )
1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion
Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's
33" Toyo M/T's on Pro Comp Xtreme Series 1069
Borla header and Catback Exhaust System
Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper
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Unread 08-24-2008, 10:40 PM   #8
SuB8HaVeN
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I've never heard of Delo before, but really any diesel rated oil is going to have those extra additives and that's the key.
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1986 Jeep CJ7 4.2L I6 T176 (restoration in progress)
1961 Willys 4x4 Wagon L-226 I6 T90 (restoration also in progress)
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Unread 08-24-2008, 10:50 PM   #9
DirtEater
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Chevron "Delo" and Shell "Rotella" are the 2 most popular Diesel oils. I prefer Delo simply because it's not as stinky.
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Terry ~ USN Ret. 30Sep07 : )
1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion
Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's
33" Toyo M/T's on Pro Comp Xtreme Series 1069
Borla header and Catback Exhaust System
Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper
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Unread 08-25-2008, 07:23 AM   #10
JeepHammer
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If you go to a high detergent oil, like Shell Rotella 15W40 or Valvoline 15W40, or Delvac or any of the other brands...

MAKE SURE YOU CHANGE YOUR OIL FILTER ABOUT EVERY 1,000 Miles for the first 5,000 miles or so!
That high detergent oil is going to scrub a LOT of crud loose in the engine, and you REALLY want to change that filter before it plugs up and the bypass opens returning that crap to the engine!
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Unread 08-25-2008, 07:42 PM   #11
mfaile
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Use baby oil

That Jeep of yours, as you call it, is really your wifes, it will run and look much better if you use baby oil......
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