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YACT: Anyone here bought Mobil 1 before?

T

TitanDiddly

Guest
I have a '84 Mercedes Benz 300D, 5-cyl turbo diesel. 212k miles.

I'm looking into changing my oil with Mobil 1 instread of the Rotella T 15W-40 that the previous owner used. It needs an oil change real badly- the oil is black black black, and low too. I put in the 3/4 quart that the previous owner left in the trunk for me- it wasn't even touching the dipstick before, now it leaves a little bit on there- but only about 1/4, and I'm still 1/2" from the lower mark.
I've heard very good things about Mobil 1 from a ranch owner and various other people. What is your experience with it? My car is a diesel, so I am planning on using 'Mobil 1 Turbo Diesel Truck 5W-40'. IIRC it's the only diesel-specialty Mobil-1. However, the ranch owner I spoke with told me that putting in normal Mobil 1 is fine, too. He does it on his F-250 and is fine with it.

How does the price compare to conventional oils?
 
~$20 for five quarts of 5w30 synthetic Mobil1. ~$13 for Castrol Syntech Blend...~$6-8 for cheap stuff. This is all 5w30, though - not sure on 5w-40.
 
Originally posted by: CadetLee
~$20 for five quarts of 5w30 synthetic Mobil1. ~$13 for Castrol Syntech Blend...~$6-8 for cheap stuff. This is all 5w30, though - not sure on 5w-40.
Click to expand...

That's not so bad. My engine takes 7.9 quarts 😱
 
Originally posted by: TitanDiddly
Originally posted by: CadetLee
~$20 for five quarts of 5w30 synthetic Mobil1. ~$13 for Castrol Syntech Blend...~$6-8 for cheap stuff. This is all 5w30, though - not sure on 5w-40.
Click to expand...

That's not so bad. My engine takes 7.9 quarts 😱
Click to expand...

A friend of mine has an F350 - I think he runs Rotella..not sure on the specifics, though.
 
Not sure I'd make the switch to Mobil 1 with that many miles on the engine. It has a tendency to remove lots of the gunk and sludge that has formed in the engine, and magically, they start leaking with the new oil. Not really the fault of the Mobil 1, but it is a better detergent, and seems to find it's way thro the slightest possibley leak.
Not sure about changing oil brands at all with that many miles. Theoretically, there should be no problem, but Old school says NEVER change brands of oil, UNLESS they're 100% compatible. (which MOST are today) I'm not a fan of Shell products. Never have been,. prolly never will be, BUT, if the engine has run it's entire life on Rotella, maybe you should stick with that.
Otherwise, if you're really set on changing, maybe you could use Castrol semi-synthetic (Syntec Blend)...I've used that in both my 96 Dakota with 215K miles on it (since it was new) and my 87 BMW 735i that has over 120K, (since it had about 30K) Niether engine burns a drop of oil between changes.

Edit...I forgot this was a DIESEL engine...Not sure the Castrol would work for you. I'll still stick by the recommendation of using the same oil it's been running on, unless there's some problem that is oil related...
 
Mobil 1 is diesel rated.

All the diesel rated oils are extremely high detergent and will work the grime out of your engine. It's not uncommon for older diesels to darken the oil. Older engines didn't burn up the diesel as efficiently and leave more ash in the oil.

I'd say stay with a 15W-40 conventional oil though -- especially Mobil Delvac. Really, really good diesel oil.
 
jkersenbr brought it up, use Mobil Delvac 15w40. Best diesel oil that is not a syn right now IMO. Also your oil will ALWAYS be black. That is ok, its a diesel. And don't use Fram oil filters.
 
Interesting posts. I'll probably use the Mobil Delvac, after reading about possible oil leaks if the 1 works a 'good' clog loose. Maybe after the engine is used to Mobil, I'l switch to 1. We'll see.
 
Using a synthetic on an old engine that didn't have it is a bad idea. Generally, the gaskets have been seasoned with the old regular oil. The synthetic will work its way through the gaskets and you'll have a lot of leaks. Stay with the regular oil.
 
For a diesel, you will want Mobil Delvac 1, not Mobil 1. Delvac 1 is Mobil's diesel formulation (just as Rotella is Shell's diesel formulation).

Shell Rotella is a good oil though.

ZV
 
Originally posted by: Marlin1975
jkersenbr brought it up, use Mobil Delvac 15w40. Best diesel oil that is not a syn right now IMO. Also your oil will ALWAYS be black. That is ok, its a diesel. And don't use Fram oil filters.
Click to expand...

Exactly. That oil turns jet black the second you start the thing
 
Originally posted by: 0
Using a synthetic on an old engine that didn't have it is a bad idea. Generally, the gaskets have been seasoned with the old regular oil. The synthetic will work its way through the gaskets and you'll have a lot of leaks. Stay with the regular oil.
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Bullsh*t.

ZV
 
just remember to change your oil when your supposed to.

changing on time rather than late will probably make a bigger a difference than using higher grade oil
 
Originally posted by: BoomerD
Not sure I'd make the switch to Mobil 1 with that many miles on the engine. It has a tendency to remove lots of the gunk and sludge that has formed in the engine, and magically, they start leaking with the new oil. Not really the fault of the Mobil 1, but it is a better detergent, and seems to find it's way thro the slightest possibley leak.
Not sure about changing oil brands at all with that many miles. Theoretically, there should be no problem, but Old school says NEVER change brands of oil, UNLESS they're 100% compatible. (which MOST are today) I'm not a fan of Shell products. Never have been,. prolly never will be, BUT, if the engine has run it's entire life on Rotella, maybe you should stick with that.
Otherwise, if you're really set on changing, maybe you could use Castrol semi-synthetic (Syntec Blend)...I've used that in both my 96 Dakota with 215K miles on it (since it was new) and my 87 BMW 735i that has over 120K, (since it had about 30K) Niether engine burns a drop of oil between changes.

Edit...I forgot this was a DIESEL engine...Not sure the Castrol would work for you. I'll still stick by the recommendation of using the same oil it's been running on, unless there's some problem that is oil related...
Click to expand...
The "old school" is wrong. As long as you drain the old oil first you can replace the oil with anything that matches the viscosity and API specifications for the engine.

Shell Rotella (as well as Shell's gasolines) is consistantly rated very highly, I don't know what you have against it.

Any well-cared-for engine should run 200,000+ miles without burning excessive amounts of oil (there is no such thing as an engine that doesn't burn any oil, but most will not burn any noticeable amount between changes, not even between 5,000 to 10,000 mile extended changes) with any name-brand oil that meets the manufacturer's specifications, so your anecdotal recommendations of Castrol just indicate that in your experience it's average.

As far as semi-synthetics, I would never recommend them. An oil only needs to have a single drop of synthetic in it to be legally labled "Synthetic Blend" or "Semi Synthetic", and there has not been any indication that a semi-synthetic offers higher performance than regular oil. You end up spending extra money for an oil that has no functionally significant amount of synthetic in the mixture. Better off to just go full synthetic.

ZV
 
Originally posted by: Zenmervolt
Originally posted by: BoomerD
Not sure I'd make the switch to Mobil 1 with that many miles on the engine. It has a tendency to remove lots of the gunk and sludge that has formed in the engine, and magically, they start leaking with the new oil. Not really the fault of the Mobil 1, but it is a better detergent, and seems to find it's way thro the slightest possibley leak.
Not sure about changing oil brands at all with that many miles. Theoretically, there should be no problem, but Old school says NEVER change brands of oil, UNLESS they're 100% compatible. (which MOST are today) I'm not a fan of Shell products. Never have been,. prolly never will be, BUT, if the engine has run it's entire life on Rotella, maybe you should stick with that.
Otherwise, if you're really set on changing, maybe you could use Castrol semi-synthetic (Syntec Blend)...I've used that in both my 96 Dakota with 215K miles on it (since it was new) and my 87 BMW 735i that has over 120K, (since it had about 30K) Niether engine burns a drop of oil between changes.

Edit...I forgot this was a DIESEL engine...Not sure the Castrol would work for you. I'll still stick by the recommendation of using the same oil it's been running on, unless there's some problem that is oil related...
Click to expand...
The "old school" is wrong. As long as you drain the old oil first you can replace the oil with anything that matches the viscosity and API specifications for the engine.

Shell Rotella (as well as Shell's gasolines) is consistantly rated very highly, I don't know what you have against it.

Any well-cared-for engine should run 200,000+ miles without burning excessive amounts of oil (there is no such thing as an engine that doesn't burn any oil, but most will not burn any noticeable amount between changes, not even between 5,000 to 10,000 mile extended changes) with any name-brand oil that meets the manufacturer's specifications, so your anecdotal recommendations of Castrol just indicate that in your experience it's average.

As far as semi-synthetics, I would never recommend them. An oil only needs to have a single drop of synthetic in it to be legally labled "Synthetic Blend" or "Semi Synthetic", and there has not been any indication that a semi-synthetic offers higher performance than regular oil. You end up spending extra money for an oil that has no functionally significant amount of synthetic in the mixture. Better off to just go full synthetic.

ZV
Click to expand...

Interesting. Would you agree with most people here who say that it's normal for the oil to be jet black even when it's just been put in?

 
Originally posted by: TitanDiddly
Originally posted by: Zenmervolt
Originally posted by: BoomerD
Not sure I'd make the switch to Mobil 1 with that many miles on the engine. It has a tendency to remove lots of the gunk and sludge that has formed in the engine, and magically, they start leaking with the new oil. Not really the fault of the Mobil 1, but it is a better detergent, and seems to find it's way thro the slightest possibley leak.
Not sure about changing oil brands at all with that many miles. Theoretically, there should be no problem, but Old school says NEVER change brands of oil, UNLESS they're 100% compatible. (which MOST are today) I'm not a fan of Shell products. Never have been,. prolly never will be, BUT, if the engine has run it's entire life on Rotella, maybe you should stick with that.
Otherwise, if you're really set on changing, maybe you could use Castrol semi-synthetic (Syntec Blend)...I've used that in both my 96 Dakota with 215K miles on it (since it was new) and my 87 BMW 735i that has over 120K, (since it had about 30K) Niether engine burns a drop of oil between changes.

Edit...I forgot this was a DIESEL engine...Not sure the Castrol would work for you. I'll still stick by the recommendation of using the same oil it's been running on, unless there's some problem that is oil related...
Click to expand...
The "old school" is wrong. As long as you drain the old oil first you can replace the oil with anything that matches the viscosity and API specifications for the engine.

Shell Rotella (as well as Shell's gasolines) is consistantly rated very highly, I don't know what you have against it.

Any well-cared-for engine should run 200,000+ miles without burning excessive amounts of oil (there is no such thing as an engine that doesn't burn any oil, but most will not burn any noticeable amount between changes, not even between 5,000 to 10,000 mile extended changes) with any name-brand oil that meets the manufacturer's specifications, so your anecdotal recommendations of Castrol just indicate that in your experience it's average.

As far as semi-synthetics, I would never recommend them. An oil only needs to have a single drop of synthetic in it to be legally labled "Synthetic Blend" or "Semi Synthetic", and there has not been any indication that a semi-synthetic offers higher performance than regular oil. You end up spending extra money for an oil that has no functionally significant amount of synthetic in the mixture. Better off to just go full synthetic.

ZV
Click to expand...

Interesting. Would you agree with most people here who say that it's normal for the oil to be jet black even when it's just been put in?
Click to expand...

Yes, on a diesel.
 
Originally posted by: TitanDiddly
Interesting. Would you agree with most people here who say that it's normal for the oil to be jet black even when it's just been put in?
Click to expand...
Well, not until after you've started the engine. 😛

But yes, a diesel, especially a diesel as old as yours (not a comment on wear, just on the state of diesel technology in the mid 80's), the oil will turn black quickly, well before the drain interval. The very high compression on diesels causes more blow-by. It's perfectly normal.

ZV
 
I just realized that the Rotella T that the previous owner was using actually is a full synthetic. In that case, I will probably stick with it. Unfortunately, I chucked the bottle in a dumpster after I topped off the engine, so it is possible that it's the Rotella non-synthetic stuff. I remember it was Rotella T, though- is there a non-synthetic 'T'?

EDIT: Looks like there is Rotella T synthetic and nonsynthetic. I'll have to ask the previous owner and see if he remembers.
 
Originally posted by: TitanDiddly
I just realized that the Rotella T that the previous owner was using actually is a full synthetic. In that case, I will probably stick with it. Unfortunately, I chucked the bottle in a dumpster after I topped off the engine, so it is possible that it's the Rotella non-synthetic stuff. I remember it was Rotella T, though- is there a non-synthetic 'T'?

EDIT: Looks like there is Rotella T synthetic and nonsynthetic. I'll have to ask the previous owner and see if he remembers.
Click to expand...
Regardless, Rotella is a quality oil in either form.

ZV
 
first off its a diesel.. dont put mobil1 in it, use Shell Rotella, which is an awesome heavy duty diesel oil.. and plus at that age moving to synthetic will kill your engine..

run shell rotella, i love the stuff.. the other option is the Mobil DELO i think.. or is it chevron..

Rotella T is awesome stuff, i use it on my motorcycle and it runs like batt out of hell.
 
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