Oil for Jeep 4.0 Engine
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Originally Posted By: aaonms
1999 Jeep Wrangler with the mighty 4.0 here too.
I am the original owner and live in northeast Florida so it gets warm here.
Some moderate trail riding these days, but hard core off roading is a thing of the past.
It is not my DD, more of a weekend toy now and owing to this, Oil Changes are usually once a year as I typically hit the 5000 miles mark at about that same time.
To make a long story only slightly shorter, I have been using Blackstone for UOA since 2003 (28,882 miles on the Jeep/Motor).
Oil of choice then was Mobil 1 10W/30.
Over time, the Lead trended up for the motor as well as compared to Universal Averages.
At first, Blackstone suspected a particle streak and not bearing related. Other values looked good.
Flash forward not quite five years to 2008 (48,553 miles) and there was a substantial increase in Lead as well as in Copper and Tin.
By 53,306 miles in 2009, Lead stabilized, but was still high. At this point, Blackstone recommend I consider switching brands of oil or moving away from synthetics.
I switched to Valvoline SYNpower 10W/30 and Lead came down for a bit, but is again on the way up.
Blackstone’s comments from the most recent Oil Change that had 4121 miles on the oil, total mileage 69,503 was: Not a lot of change since 2011, though you are getting a little more bearing wear than you used to. We've seen lead out of this engine before, and it didn't amount to much, so maybe it will drop again. We're a little concerned, though, seeing copper and lead both reading high. Typically this shows bearing wear and it could be the result of hard operation, or it could show a problem brewing. This engine is known for antifreeze, though it's hard to say for sure because the sodium in this oil masks sodium that might be coming from coolant. Stay at 3K-4K miles to monitor.
Am considering dumping the oil at 2000 miles, sending a sample to Blackstone, and also changing brands again.
I had good results with Rotella in several VW’s (both turbo and NA) and am also pleased with the German Castrol in my current turbo MINI.
While it pains me to think non-synthetic may be the way to go, some readings here and on several Jeep Forums makes me wonder if this may not be the way to go.
Iirc KCJeep likes PYB 10w-30 and has uoa showing low wear meals using it. I think rotella conventional also shows well in the jeeps straight 6.
Pm KCJeep. He'd be the guy to ask when it comes to these engines. He has alot of experience.
Elevated lead with M1 way. I read that so often in relation to M1 its hard for me to not get sucked in to feeling that its just not all that great of an oil.
It used to be the best and was THE standard in synthetic oil,now I don't feel its any better than anything else on the shelf. PU in my opinion is the daddy now,not including boutique and mail order.
Have you considered redline lubricants. I think your engine is a prime candidate. I'll bet lead drops significantly after the second or third sample after the oil washes out the old oils
1999 Jeep Wrangler with the mighty 4.0 here too.
I am the original owner and live in northeast Florida so it gets warm here.
Some moderate trail riding these days, but hard core off roading is a thing of the past.
It is not my DD, more of a weekend toy now and owing to this, Oil Changes are usually once a year as I typically hit the 5000 miles mark at about that same time.
To make a long story only slightly shorter, I have been using Blackstone for UOA since 2003 (28,882 miles on the Jeep/Motor).
Oil of choice then was Mobil 1 10W/30.
Over time, the Lead trended up for the motor as well as compared to Universal Averages.
At first, Blackstone suspected a particle streak and not bearing related. Other values looked good.
Flash forward not quite five years to 2008 (48,553 miles) and there was a substantial increase in Lead as well as in Copper and Tin.
By 53,306 miles in 2009, Lead stabilized, but was still high. At this point, Blackstone recommend I consider switching brands of oil or moving away from synthetics.
I switched to Valvoline SYNpower 10W/30 and Lead came down for a bit, but is again on the way up.
Blackstone’s comments from the most recent Oil Change that had 4121 miles on the oil, total mileage 69,503 was: Not a lot of change since 2011, though you are getting a little more bearing wear than you used to. We've seen lead out of this engine before, and it didn't amount to much, so maybe it will drop again. We're a little concerned, though, seeing copper and lead both reading high. Typically this shows bearing wear and it could be the result of hard operation, or it could show a problem brewing. This engine is known for antifreeze, though it's hard to say for sure because the sodium in this oil masks sodium that might be coming from coolant. Stay at 3K-4K miles to monitor.
Am considering dumping the oil at 2000 miles, sending a sample to Blackstone, and also changing brands again.
I had good results with Rotella in several VW’s (both turbo and NA) and am also pleased with the German Castrol in my current turbo MINI.
While it pains me to think non-synthetic may be the way to go, some readings here and on several Jeep Forums makes me wonder if this may not be the way to go.
Iirc KCJeep likes PYB 10w-30 and has uoa showing low wear meals using it. I think rotella conventional also shows well in the jeeps straight 6.
Pm KCJeep. He'd be the guy to ask when it comes to these engines. He has alot of experience.
Elevated lead with M1 way. I read that so often in relation to M1 its hard for me to not get sucked in to feeling that its just not all that great of an oil.
It used to be the best and was THE standard in synthetic oil,now I don't feel its any better than anything else on the shelf. PU in my opinion is the daddy now,not including boutique and mail order.
Have you considered redline lubricants. I think your engine is a prime candidate. I'll bet lead drops significantly after the second or third sample after the oil washes out the old oils
Originally Posted By: 901Memphis
10w30 is obsolete.
So am I. The vultures are in the sky circling overhead.
10w30 is obsolete.
So am I. The vultures are in the sky circling overhead.
I have an 03 Rubicon with the 4.0 and use it mostly on the weekends and for trail rides. I currently have 10-30 napa synthetic in it cause it was on sale. However it's getting ready to be changed out and at the end of this month it will be trailered to Colorado for a week of fun. So, is the Rotella T5 10-30 the way to go in this engine? I've also been using the Napa gold oil filters.
There's a lot of good choices but you absolutely can't go wrong with Rotella 10w30 IMO. Awesome pick.
Napa Gold filters are very high quality I have had start up problems with them though however my current Jeep is inordinately picky in that regard.
Used them for years on my XJ with no issues whatsoever, try 'em you'll probably like them.
Still using a Napa Gold on my wife's KIA Sedona.
Used them for years on my XJ with no issues whatsoever, try 'em you'll probably like them.
Still using a Napa Gold on my wife's KIA Sedona.
Originally Posted By: JValdez
I have an 03 Rubicon with the 4.0 and use it mostly on the weekends and for trail rides. I currently have 10-30 napa synthetic in it cause it was on sale. However it's getting ready to be changed out and at the end of this month it will be trailered to Colorado for a week of fun. So, is the Rotella T5 10-30 the way to go in this engine? I've also been using the Napa gold oil filters.
Look for whats on sale like you did with the napa oil and consider your options based on bang for buck. The rotella is great stuff but its only sold in 1qt and 4qt (gallon) jugs. so for a 6qt sump its a PITA kinda (I usually bought 2 gallons and let 2qts sit till my next oil change where I only needed 4 more qts. If you buy 2 seperate 1qt containers it can cost a bit more as they mark those up in price usually making the rotella less of a perfect choice.
I have an 03 Rubicon with the 4.0 and use it mostly on the weekends and for trail rides. I currently have 10-30 napa synthetic in it cause it was on sale. However it's getting ready to be changed out and at the end of this month it will be trailered to Colorado for a week of fun. So, is the Rotella T5 10-30 the way to go in this engine? I've also been using the Napa gold oil filters.
Look for whats on sale like you did with the napa oil and consider your options based on bang for buck. The rotella is great stuff but its only sold in 1qt and 4qt (gallon) jugs. so for a 6qt sump its a PITA kinda (I usually bought 2 gallons and let 2qts sit till my next oil change where I only needed 4 more qts. If you buy 2 seperate 1qt containers it can cost a bit more as they mark those up in price usually making the rotella less of a perfect choice.
Originally Posted By: aaonms
1999 Jeep Wrangler with the mighty 4.0 here too.
I am the original owner and live in northeast Florida so it gets warm here.
Some moderate trail riding these days, but hard core off roading is a thing of the past.
It is not my DD, more of a weekend toy now and owing to this, Oil Changes are usually once a year as I typically hit the 5000 miles mark at about that same time.
To make a long story only slightly shorter, I have been using Blackstone for UOA since 2003 (28,882 miles on the Jeep/Motor).
Oil of choice then was Mobil 1 10W/30.
Over time, the Lead trended up for the motor as well as compared to Universal Averages.
At first, Blackstone suspected a particle streak and not bearing related. Other values looked good.
Flash forward not quite five years to 2008 (48,553 miles) and there was a substantial increase in Lead as well as in Copper and Tin.
By 53,306 miles in 2009, Lead stabilized, but was still high. At this point, Blackstone recommend I consider switching brands of oil or moving away from synthetics.
I switched to Valvoline SYNpower 10W/30 and Lead came down for a bit, but is again on the way up.
Blackstone’s comments from the most recent Oil Change that had 4121 miles on the oil, total mileage 69,503 was: Not a lot of change since 2011, though you are getting a little more bearing wear than you used to. We've seen lead out of this engine before, and it didn't amount to much, so maybe it will drop again. We're a little concerned, though, seeing copper and lead both reading high. Typically this shows bearing wear and it could be the result of hard operation, or it could show a problem brewing. This engine is known for antifreeze, though it's hard to say for sure because the sodium in this oil masks sodium that might be coming from coolant. Stay at 3K-4K miles to monitor.
Am considering dumping the oil at 2000 miles, sending a sample to Blackstone, and also changing brands again.
I had good results with Rotella in several VW’s (both turbo and NA) and am also pleased with the German Castrol in my current turbo MINI.
While it pains me to think non-synthetic may be the way to go, some readings here and on several Jeep Forums makes me wonder if this may not be the way to go.
Switched to PZ Platinum 5W/30 and did a ~4500 mile run.
Sodium is less than half of what it was using SYNpower 10W/30.
Lead is down and copper showed a slight drop from 7 to 6.
1999 Jeep Wrangler with the mighty 4.0 here too.
I am the original owner and live in northeast Florida so it gets warm here.
Some moderate trail riding these days, but hard core off roading is a thing of the past.
It is not my DD, more of a weekend toy now and owing to this, Oil Changes are usually once a year as I typically hit the 5000 miles mark at about that same time.
To make a long story only slightly shorter, I have been using Blackstone for UOA since 2003 (28,882 miles on the Jeep/Motor).
Oil of choice then was Mobil 1 10W/30.
Over time, the Lead trended up for the motor as well as compared to Universal Averages.
At first, Blackstone suspected a particle streak and not bearing related. Other values looked good.
Flash forward not quite five years to 2008 (48,553 miles) and there was a substantial increase in Lead as well as in Copper and Tin.
By 53,306 miles in 2009, Lead stabilized, but was still high. At this point, Blackstone recommend I consider switching brands of oil or moving away from synthetics.
I switched to Valvoline SYNpower 10W/30 and Lead came down for a bit, but is again on the way up.
Blackstone’s comments from the most recent Oil Change that had 4121 miles on the oil, total mileage 69,503 was: Not a lot of change since 2011, though you are getting a little more bearing wear than you used to. We've seen lead out of this engine before, and it didn't amount to much, so maybe it will drop again. We're a little concerned, though, seeing copper and lead both reading high. Typically this shows bearing wear and it could be the result of hard operation, or it could show a problem brewing. This engine is known for antifreeze, though it's hard to say for sure because the sodium in this oil masks sodium that might be coming from coolant. Stay at 3K-4K miles to monitor.
Am considering dumping the oil at 2000 miles, sending a sample to Blackstone, and also changing brands again.
I had good results with Rotella in several VW’s (both turbo and NA) and am also pleased with the German Castrol in my current turbo MINI.
While it pains me to think non-synthetic may be the way to go, some readings here and on several Jeep Forums makes me wonder if this may not be the way to go.
Switched to PZ Platinum 5W/30 and did a ~4500 mile run.
Sodium is less than half of what it was using SYNpower 10W/30.
Lead is down and copper showed a slight drop from 7 to 6.
Some of the best UOA's you'll ever see in the Jeep 4.0 come from conventionals.
Have you seen Jeepman3071's recent PYB UOA? It is spectacular.
Jeepman3071 Jeep 4.0 PYB UOA
At the frequency you are changing oil you are wasting money on synthetics anyway. Something to ponder.
Have you seen Jeepman3071's recent PYB UOA? It is spectacular.
Jeepman3071 Jeep 4.0 PYB UOA
At the frequency you are changing oil you are wasting money on synthetics anyway. Something to ponder.
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