I will be picking up a "new to me" '92 wrangler renegade 4.0 5spd in a week or so. Engine has 140k miles and runs great, but with unknown service history. Appears to have a slow seep at the valve cover gasket (and possibly rear of cylinder head) but nothing to really worry about. Would Delo 15w40 (non-LE) be a good choice for this motor? If not, what would you guys recommend?
Oil for '92 wrangler 4.0?
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10w40 maxlife has shown the best results in the 4.0's that i've owned.
my 89 had an o-ring gasket on the valve cover. of course, I just sealed it with RTV when it started to leak. Maxlife sounds good but I also like your choice of Delo.
The 15w40 HDEO's are just so awful thick I'd only use them as a last resort. I've tried them twice in my 4.0 and neither had a happy ending. I'd try a heavy 10w30 first like Rotella, or at most a 10w40, Maxlife is a good choice but plain old Pennzoil works real well in the 4.0 as well, the high moly it does like.
Rear main leak, maybe?
Try Rotella T5 10w30, Wal-Mart sells it for $16 or so for 1 gallon jugs.
Try Rotella T5 10w30, Wal-Mart sells it for $16 or so for 1 gallon jugs.
15W40 would work for your Jeep in your climate. Personally, it won't really care what you run, within reason (i.e using SAE50 in a MN winter). I run 5W30 in most of my Jeeps during the winter(those that are driven) and 10W30/10W40/SAE30 the remaining 3 seasons.
I think going to a 10W30 would be fine.
I think going to a 10W30 would be fine.
Originally Posted By: mopar_monkey
10w40 maxlife has shown the best results in the 4.0's that i've owned.
Agreed!! 10W-40 Maxlife is the protein shake for that Jeep.
10w40 maxlife has shown the best results in the 4.0's that i've owned.
Agreed!! 10W-40 Maxlife is the protein shake for that Jeep.
The manual calls for 5w30 when temps are below 0 degrees F or 10w30 if higher 0 F. I use 10w30 in winter and Delo 15w40 in warm weather here in AL. Mine also has minor seepage around valve cover and else where. Otherwise a REALLY good strong motor we have.
Pennzoil Platinum 10W30.
http://www.jeepforum.com/
Rotella T5 10w30 or t-6 5w40
Rotella T5 10w30 or t-6 5w40
Originally Posted By: Merkava_4
Originally Posted By: mopar_monkey
10w40 maxlife has shown the best results in the 4.0's that i've owned.
Agreed!! 10W-40 Maxlife is the protein shake for that Jeep.
40 FTW! Muscle Milk.
I just talked to my friend with the 4.0L I6 in a Cherokee Classic of the same year or a 91. If consensus is that the engine loves a 40-weight similar to a 4.3L GM Vortec V6, then go for it!
Originally Posted By: mopar_monkey
10w40 maxlife has shown the best results in the 4.0's that i've owned.
Agreed!! 10W-40 Maxlife is the protein shake for that Jeep.
40 FTW! Muscle Milk.
I just talked to my friend with the 4.0L I6 in a Cherokee Classic of the same year or a 91. If consensus is that the engine loves a 40-weight similar to a 4.3L GM Vortec V6, then go for it!
defintely not a good motor for thin oil, do any 40wt oil from 0w40 to 15w40 depending on the climate.
Originally Posted By: 4x4chevydude
defintely not a good motor for thin oil, do any 40wt oil from 0w40 to 15w40 depending on the climate.
Gary ran Bruceblend 0W10 in his 2.5L with surprising results.
Any 10w30 or 10w40 will be fine. No real need for syn either.
defintely not a good motor for thin oil, do any 40wt oil from 0w40 to 15w40 depending on the climate.
Any 10w30 or 10w40 will be fine. No real need for syn either.
Originally Posted By: KCJeep
The 15w40 HDEO's are just so awful thick I'd only use them as a last resort. I've tried them twice in my 4.0 and neither had a happy ending. I'd try a heavy 10w30 first like Rotella, or at most a 10w40, Maxlife is a good choice but plain old Pennzoil works real well in the 4.0 as well, the high moly it does like.
x2. Even with a 5w30 my 4.0 is fairly quiet with Pennzoil conventional. For your climate I'd run Pennzoil 10w30 conventional or 10w40. Can't beat the oil for the price.
The 15w40 HDEO's are just so awful thick I'd only use them as a last resort. I've tried them twice in my 4.0 and neither had a happy ending. I'd try a heavy 10w30 first like Rotella, or at most a 10w40, Maxlife is a good choice but plain old Pennzoil works real well in the 4.0 as well, the high moly it does like.
x2. Even with a 5w30 my 4.0 is fairly quiet with Pennzoil conventional. For your climate I'd run Pennzoil 10w30 conventional or 10w40. Can't beat the oil for the price.
True, the older 4.0's do like heavy oils, I'd still want a 10w40 at most not a 15w40, and trying a thickish 10w30 is still worth your time IMO.
The newest 4.0's (still getting old now) do not seem to like the 40's near as well, definitely played out that way with mine and I'm not the only one to have noticed this.
My old XJ I could put most anything in, but it sounded like a brass band on 5w30, my 04 WJ has 5w30 in it now and it's the quietest it's ever been, go figure.
The newest 4.0's (still getting old now) do not seem to like the 40's near as well, definitely played out that way with mine and I'm not the only one to have noticed this.
My old XJ I could put most anything in, but it sounded like a brass band on 5w30, my 04 WJ has 5w30 in it now and it's the quietest it's ever been, go figure.
For that climate, there shouldn't be any problem running a 15w40. I'm not envisioning a lot of terribly cold starts there.
Reality is these engines are not terribly picky about the oil used in them. I've run 5w30, 10w30, and 5w40. Settled in on a 5w30 Winter / 10w30 Summer routine with zero problems, and UOA based to boot. There was little difference between the 5w40 and dino xw30 oils in my usage.
Reality is these engines are not terribly picky about the oil used in them. I've run 5w30, 10w30, and 5w40. Settled in on a 5w30 Winter / 10w30 Summer routine with zero problems, and UOA based to boot. There was little difference between the 5w40 and dino xw30 oils in my usage.
I have ran Mobil 1 Turbo Diesel Truck 5w-40 in mine and it loved it
I am now running Mobil 1 0w-40 for the cold and its even quieter at start up.
I agree with rotella t5 or rotella t6 which are both great oils.
Like others have said, 15w40 is just so thick at start up. Id keep it to a 10w-XX or lower but the 15w40 will work if you don't do alot of cold starts. you could try it and if it makes a racket at start up try to thin it with just a bit of MMO, then you will know for sure and you can have a nice OCI to get the cleaning started in your unknown history engine.
I am now running Mobil 1 0w-40 for the cold and its even quieter at start up.
I agree with rotella t5 or rotella t6 which are both great oils.
Like others have said, 15w40 is just so thick at start up. Id keep it to a 10w-XX or lower but the 15w40 will work if you don't do alot of cold starts. you could try it and if it makes a racket at start up try to thin it with just a bit of MMO, then you will know for sure and you can have a nice OCI to get the cleaning started in your unknown history engine.
Thanks guys. Reason for the Delo 15w40 is we use that stuff in our tractors, and it's essentially free to me. We do also have a generic synthetic blend 10w30, but I believe it is an "energyy conserving" oil and I thought it too thin for this motor. Would it be wise to run a mix of the Delo & 10w30 syn blend in the winter (temps down to 30 deg)? Or just stick with the Delo year round?
I thought of running synthetic oil (either Mobil 1 10w40 HM or Mobil 1 Turbo Diesel Truck), but spend enough on oil as it is, especially for my work truck that gets synthetic oil changes every 2 months or so (~8k oci).
I thought of running synthetic oil (either Mobil 1 10w40 HM or Mobil 1 Turbo Diesel Truck), but spend enough on oil as it is, especially for my work truck that gets synthetic oil changes every 2 months or so (~8k oci).
Found this info on our "generic" 10w30:
Performance 500 Motor Oils
5W20, 5W30, 10W30 GF-4/SM*, 20W50 GF-3/SL*
CUSTOMER BENEFITS
• Outstanding anti-wear protection
• Defense against thermal breakdown
• Cleaner engine and positive crankcase ventilation
• API SM, SL, and previous API “S” categories
FEATURES
Performance 500 Motor Oils are top quality automotive engine oils formulated with premium base stocks, shear stable viscosity index improver, dispersant inhibitor, wear control modifier, anti-sludge detergent, corrosion inhibitor, antioxidant, and a foam suppressant.
This special formulation creates a high viscosity index for GP’s Performance 500 Motor Oils, which guarantees low viscosities at low temperatures for easy cold starting and steady warm up; while maintaining viscosity at high temperatures for improved oil economy, fuel economy, and forming the sought after protective film over engine parts.
Anti-wear additives offer outstanding wear protection as engine parts slide smoothly against each other there-by preventing scoring.
GP’s Performance 500 Motor Oils contain a high level of dispersants protecting against deposits and sludge formation in stop-and-go driving conditions. A recently developed friction modifier, dispersant, antioxidant, and corrosion inhibitor has proven to sustain high temperature operation, stop corrosion, forms an oxidation stability preventing viscosity increase, and eliminates oil gelling in the crankcase. All this allows your engine to provide maximum performance at maximum oil changing intervals.
APPLICATIONS
GP Performance 500 Motor Oils are recommended for all four-stroke gasoline engines used in passenger cars, light trucks, powerboats, motorcycles, and other mobile and stationary equipment. They are exceptional for high-revving engines in small cars and light trucks. All grades are specialty formulated for use in turbocharged engines.
TYPICAL TEST DATA
Test ASTM Unit 5W-20 5w30 10w30 20W-50
Viscosity Cold Crank D5293 °C/Poise -30/45 -30/63 -25/66 -15/80
Viscosity @100 °C D445 cSt 8.5 10.0 11.0 19.0
Viscosity @40 °C D445 cSt 47.5 64.0 70.0 175.0
Viscosity Index - - 157 141 148 123
Pour Point D97 °C -45 -39 -39 -30
Flash Point D92 °C 216 220 224 230
Base Number D2896 mgKOH/g 7.5 7.5 7.5 7.9
Zinc D4951 % wt 0.083 0.083 0.083 0.083
Phosphorus D4951 % wt 0.076 0.076 0.076 0.076
Color ASTM D1500 - 3 3.5 3.5 3.5
API Gravity - - 32.3 32.0 31.0 29.0
Note: Typical test data are averages only, minor variations which do not affect the products ability to perform are to be expected.
*Conforms, meets, and in many cases exceeds industry standards.
Performance 500 Motor Oils
5W20, 5W30, 10W30 GF-4/SM*, 20W50 GF-3/SL*
CUSTOMER BENEFITS
• Outstanding anti-wear protection
• Defense against thermal breakdown
• Cleaner engine and positive crankcase ventilation
• API SM, SL, and previous API “S” categories
FEATURES
Performance 500 Motor Oils are top quality automotive engine oils formulated with premium base stocks, shear stable viscosity index improver, dispersant inhibitor, wear control modifier, anti-sludge detergent, corrosion inhibitor, antioxidant, and a foam suppressant.
This special formulation creates a high viscosity index for GP’s Performance 500 Motor Oils, which guarantees low viscosities at low temperatures for easy cold starting and steady warm up; while maintaining viscosity at high temperatures for improved oil economy, fuel economy, and forming the sought after protective film over engine parts.
Anti-wear additives offer outstanding wear protection as engine parts slide smoothly against each other there-by preventing scoring.
GP’s Performance 500 Motor Oils contain a high level of dispersants protecting against deposits and sludge formation in stop-and-go driving conditions. A recently developed friction modifier, dispersant, antioxidant, and corrosion inhibitor has proven to sustain high temperature operation, stop corrosion, forms an oxidation stability preventing viscosity increase, and eliminates oil gelling in the crankcase. All this allows your engine to provide maximum performance at maximum oil changing intervals.
APPLICATIONS
GP Performance 500 Motor Oils are recommended for all four-stroke gasoline engines used in passenger cars, light trucks, powerboats, motorcycles, and other mobile and stationary equipment. They are exceptional for high-revving engines in small cars and light trucks. All grades are specialty formulated for use in turbocharged engines.
TYPICAL TEST DATA
Test ASTM Unit 5W-20 5w30 10w30 20W-50
Viscosity Cold Crank D5293 °C/Poise -30/45 -30/63 -25/66 -15/80
Viscosity @100 °C D445 cSt 8.5 10.0 11.0 19.0
Viscosity @40 °C D445 cSt 47.5 64.0 70.0 175.0
Viscosity Index - - 157 141 148 123
Pour Point D97 °C -45 -39 -39 -30
Flash Point D92 °C 216 220 224 230
Base Number D2896 mgKOH/g 7.5 7.5 7.5 7.9
Zinc D4951 % wt 0.083 0.083 0.083 0.083
Phosphorus D4951 % wt 0.076 0.076 0.076 0.076
Color ASTM D1500 - 3 3.5 3.5 3.5
API Gravity - - 32.3 32.0 31.0 29.0
Note: Typical test data are averages only, minor variations which do not affect the products ability to perform are to be expected.
*Conforms, meets, and in many cases exceeds industry standards.
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