Switched 1981 928 to synthetic oil
#16
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Originally Posted by PorKen
I didn't notice any more leaks with synthetic. The oil stains are merely more expensive.
I was at Walmart a while back and noticed that the 5 quart jugs of Mobil One Truck/SUV are now 5-30, from 5-40. I'll be switching to Shell Rotella-T diesel 5-40 synthetic, which is ~$12/gal, for our euro fleet.
1981 928 (mine)
1990 300TE Merc wagon (doggies)
1995 900SE SAAB cab (hers)
I was at Walmart a while back and noticed that the 5 quart jugs of Mobil One Truck/SUV are now 5-30, from 5-40. I'll be switching to Shell Rotella-T diesel 5-40 synthetic, which is ~$12/gal, for our euro fleet.
1981 928 (mine)
1990 300TE Merc wagon (doggies)
1995 900SE SAAB cab (hers)
DITTO! I forgot to ask about that here. I think (opinion comming) that that makes that oil useless to me here in SoCal.
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Hi Brendan,
the old Delvac 1 5w-40 (M1 T&SUV 5w-40) is still available. The T&SUV version in the US has been renamed but the formulation remains. Delvac 1 5w-40 is still available from Commercial sources - Truck Stops/Distributors etc- as it is here in OZ and around the World
Rotella T 5w-40 is a Group 3 hydrocracked synthetic oil and is an excellent product
Delvac 1 5w-40 (M1 T&SUV 5w-40 etc) is Group 5 synthetic with a significant Ester content and some seal swell benefits etc too
Regards
Doug
the old Delvac 1 5w-40 (M1 T&SUV 5w-40) is still available. The T&SUV version in the US has been renamed but the formulation remains. Delvac 1 5w-40 is still available from Commercial sources - Truck Stops/Distributors etc- as it is here in OZ and around the World
Rotella T 5w-40 is a Group 3 hydrocracked synthetic oil and is an excellent product
Delvac 1 5w-40 (M1 T&SUV 5w-40 etc) is Group 5 synthetic with a significant Ester content and some seal swell benefits etc too
Regards
Doug
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Originally Posted by PorKen
I didn't notice any more leaks with synthetic. The oil stains are merely more expensive.
I was at Walmart a while back and noticed that the 5 quart jugs of Mobil One Truck/SUV are now 5-30, from 5-40. I'll be switching to Shell Rotella-T diesel 5-40 synthetic, which is ~$12/gal, for our euro fleet.
1981 928 (mine)
1990 300TE Merc wagon (doggies)
1995 900SE SAAB cab (hers)
I was at Walmart a while back and noticed that the 5 quart jugs of Mobil One Truck/SUV are now 5-30, from 5-40. I'll be switching to Shell Rotella-T diesel 5-40 synthetic, which is ~$12/gal, for our euro fleet.
1981 928 (mine)
1990 300TE Merc wagon (doggies)
1995 900SE SAAB cab (hers)
Rotella-T is what is in my leaking 928.
#19
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The M1 T&SUV oil I saw, that was in the same place the old 5/40 was, is now 5/30 Doug.
I did try it (5/40) but it splashed so much in my euro that I had to stop usuing it. Too much was sucked into the intake. WAY too much. Usuing 15/50 stops that, and it never gets below 50 (F) here anyway.
I did try it (5/40) but it splashed so much in my euro that I had to stop usuing it. Too much was sucked into the intake. WAY too much. Usuing 15/50 stops that, and it never gets below 50 (F) here anyway.
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Hi Brendan,
as I recall there are two versions sold in the US - a 5w-30 and the "original" 5w-40 - even perhaps with different names
They are not sold in OZ
Never heard of the "splashing" problem though! And never experienced it in any engine family using it here
Doug
as I recall there are two versions sold in the US - a 5w-30 and the "original" 5w-40 - even perhaps with different names
They are not sold in OZ
Never heard of the "splashing" problem though! And never experienced it in any engine family using it here
Doug
#21
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New M1 5W-40 here:
http://www.mobiloil.com/USA-English/...uck_5W-40.aspx
In addition to the name change, the new product lost the SL API designation. The diesel only designation(Cx)would appear appropriate for diesel engines only. I say "appear" because it has been speculated that Mobil, in an attempt to sell its other M1 oils to gas engine customers, simply changed the name of the 5W-40, maintained the diesel rating, and targeting it for the diesel truck market. Marketing only? Doug, what are your thoughts? Is the 5W-40 still appropriate for gas engines?
http://www.mobiloil.com/USA-English/...uck_5W-40.aspx
In addition to the name change, the new product lost the SL API designation. The diesel only designation(Cx)would appear appropriate for diesel engines only. I say "appear" because it has been speculated that Mobil, in an attempt to sell its other M1 oils to gas engine customers, simply changed the name of the 5W-40, maintained the diesel rating, and targeting it for the diesel truck market. Marketing only? Doug, what are your thoughts? Is the 5W-40 still appropriate for gas engines?
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Just to add fuel to the fire....
-In college, they taught us to never change from dino-juice to synthetic oil. Why? Well, after years and years of running on dino, your engine develops deposites in specific places where the oil stagnates. These gummy deposits, called "kudos" for lack of a better word, do no harm and are happy to grow through the life of your engine. Until you switch to synthetic...
Then they come loose. They dislodge, not only from the better lubrication provided by synthetic oil, but also because the synthetic oil contains different detergents and eventually breaks them free. Cleaner engine is a better engine right? Wrong. Those now-free kudos need to go somewhere, and it is possible that they can come together and form a blockage at some important point, like the entrance to one of the bearings. In short order, your engine has a "heart attack" and you can potentially do damage to a bearing or worse. Aircraft reciprocating engines are always run on either dino ["ashless dispersant oil"] or synthetic for their whole life just for this reason. Turbine engines are so sensitive to oil that they even require you to use the same BRAND for the whole life of the engine!
I recently changed from Castrol 20/50 on my '85 S2 to Delvac based largely on what Hillary has posted on here. I haven't noticed any change in leakage [I have a small leak from the pan], but nor have I noticed any change in useage...or much of anything. Damn that stuff was expensive though....
N!
-In college, they taught us to never change from dino-juice to synthetic oil. Why? Well, after years and years of running on dino, your engine develops deposites in specific places where the oil stagnates. These gummy deposits, called "kudos" for lack of a better word, do no harm and are happy to grow through the life of your engine. Until you switch to synthetic...
Then they come loose. They dislodge, not only from the better lubrication provided by synthetic oil, but also because the synthetic oil contains different detergents and eventually breaks them free. Cleaner engine is a better engine right? Wrong. Those now-free kudos need to go somewhere, and it is possible that they can come together and form a blockage at some important point, like the entrance to one of the bearings. In short order, your engine has a "heart attack" and you can potentially do damage to a bearing or worse. Aircraft reciprocating engines are always run on either dino ["ashless dispersant oil"] or synthetic for their whole life just for this reason. Turbine engines are so sensitive to oil that they even require you to use the same BRAND for the whole life of the engine!
I recently changed from Castrol 20/50 on my '85 S2 to Delvac based largely on what Hillary has posted on here. I haven't noticed any change in leakage [I have a small leak from the pan], but nor have I noticed any change in useage...or much of anything. Damn that stuff was expensive though....
N!
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Unfortunatley, in san diego walmarts, where I buy my oil, there has been a serious shortage of mobile 1 products that I buy, other then the norma, 10/30 stuff which I do not. I may just simply switch back to redline or amsoil just so I can buy cases and cases and simply have them show up at my door. COnstantly having my wife go to wally world to look to no avail is taxing my marriage. ![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
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Originally Posted by Doug Hillary
Hi Brendan,
as I recall there are two versions sold in the US - a 5w-30 and the "original" 5w-40 - even perhaps with different names
They are not sold in OZ
Never heard of the "splashing" problem though! And never experienced it in any engine family using it here
Doug
as I recall there are two versions sold in the US - a 5w-30 and the "original" 5w-40 - even perhaps with different names
They are not sold in OZ
Never heard of the "splashing" problem though! And never experienced it in any engine family using it here
Doug
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Hi,
JTM - I suspect that Mobil are doing some formulation and Brand engineering along with a little more Market "positioning"! IMHO - they are a disastrous Marketing organisation in OZ - especially with Delvac. Then of course it is a Commercial oil and known well to Commercial users
Observations:
a) I think the new API SM 10w-30 vesion of M1 "T & SUV" is being targeted for CAFE reasons
b) The new M1 Turbo Diesel 5w-40 to API's CI-4 Plus spec is still lineball with Delvac 1 5w-40
c) Delvac 1 5w-40 (from whence the original M1 T&SUV 5w-40 originated) is still the same but it did have a formulation change about two years ago. This made it a little more viscous at 40C (102cSt against 92cSt) but retained its other qualities and some were enhanced - at this stage T&SUV then appeared on the Market in the US
I use Delvac 1 5w-40 and keep a stock of 2 x 20 litres. It is used in a variety of my engines from my MY89 S4, through Benz diesels & petrols to GM V8s, RAV4s, VWs and etc. Great in ride-ons too!
I buy this from a Mobil Distributor and it is available from Mobil Truck Stops and etc on order
For my heavy diesels we use bulk storage for Delvac 1 5w-40 at the service workshop
If I lived in the US I would be happy to use either of;
1 - the "new" M1 5w-40 Turbo Diesel (API CI-4 Plus) oil, or
2 - Delvac 1 5w-40
As mentioned earlier there are many great oils available in a 5w-40 viscosity that may be suitable for a 928
Normy - I am pleased to see your change was as predicted. This has always been my experience over the last decade or two. It was not this way in the 1970s but oil technologies have moved on
I contacted the originater of this thread privately and provided him with a procedure to consider when changing form a Mineral to a Synthetic engine lubricant
Regards
Doug
JTM - I suspect that Mobil are doing some formulation and Brand engineering along with a little more Market "positioning"! IMHO - they are a disastrous Marketing organisation in OZ - especially with Delvac. Then of course it is a Commercial oil and known well to Commercial users
Observations:
a) I think the new API SM 10w-30 vesion of M1 "T & SUV" is being targeted for CAFE reasons
b) The new M1 Turbo Diesel 5w-40 to API's CI-4 Plus spec is still lineball with Delvac 1 5w-40
c) Delvac 1 5w-40 (from whence the original M1 T&SUV 5w-40 originated) is still the same but it did have a formulation change about two years ago. This made it a little more viscous at 40C (102cSt against 92cSt) but retained its other qualities and some were enhanced - at this stage T&SUV then appeared on the Market in the US
I use Delvac 1 5w-40 and keep a stock of 2 x 20 litres. It is used in a variety of my engines from my MY89 S4, through Benz diesels & petrols to GM V8s, RAV4s, VWs and etc. Great in ride-ons too!
I buy this from a Mobil Distributor and it is available from Mobil Truck Stops and etc on order
For my heavy diesels we use bulk storage for Delvac 1 5w-40 at the service workshop
If I lived in the US I would be happy to use either of;
1 - the "new" M1 5w-40 Turbo Diesel (API CI-4 Plus) oil, or
2 - Delvac 1 5w-40
As mentioned earlier there are many great oils available in a 5w-40 viscosity that may be suitable for a 928
Normy - I am pleased to see your change was as predicted. This has always been my experience over the last decade or two. It was not this way in the 1970s but oil technologies have moved on
I contacted the originater of this thread privately and provided him with a procedure to consider when changing form a Mineral to a Synthetic engine lubricant
Regards
Doug
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I'm very glad this thread was bumped back up. I would not have given it another thought on switching oil. I always ran Royal Purple in my boat, but use MB-1 in all the vehicles and was going to do that in the next week or 2 in the S4. Now I just need to do some record search on mine to see wtf was being run in there.
I do know it is clean tho.
I do know it is clean tho.
#29
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Well it has been 2 weeks now since I switch over to synthetic on the 81. I have been driving the car everyday since and checking every two days or so and thus far - no leaks or issues.
Im sure its my imagination, but sometimes it seems that the engine is actually running better.
Im sure its my imagination, but sometimes it seems that the engine is actually running better.
#30
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I use Mobile 1 15-50. I bought 8 litres today at the only place in town that I could find that sells 15-50 and they told me it in now discontinued from their inventory list. It was all the inventory they had or I would have bought a case.
Don't know if that means Mobile is discontinuing it or if "Parts Source" is. Intend to find out.
Don't know if that means Mobile is discontinuing it or if "Parts Source" is. Intend to find out.