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Preferred choice of oil

8

89SWB

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Wondering what weight of oil is best for these trucks? The cap on the engine states 15W-40, seems awful heavy. Down here in Georgia, freezing temps are never an issue, would think a lighter weight oil would be better on the engine components.

Thoughts?
 
The clearances are somewhat loose in these engines. More modern gasoline engines have way tighter clearances, especially on the bearings. Stick to the 15-40. Some guys up north here use 0-40 in the winter but they all go back to the 15-40 in the summer.
 
the thicker the oil in the summer the less it breaks down. oils like 5w-30 and 5w-20 are almost watery when hot. the oil in the 6.5s get quite hot. i don't know exactly how hot but i believe its over 200 degrees. i'd say stick with the 15w-40 as well. i used 15w-40 rotella dino oil all winter and it was fine. i'm switching to amsoil 15w-40 synthetic as i type this. just waiting on greg's oil cooler lines from UPS:)prrr:) to get here.
 
Stay with 15W-40. Yesterday, I changed the oil in my truck and I refilled with Lucas 15/40 High TBN Truck Oil ( http://www.lucasoil.com/products/display_products.sd?iid=48&catid=4&loc=show )
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inkl. one bottle of Lucas Heavy Duty Oil Stabilizer ( http://www.lucasoil.com/products/display_products.sd?iid=25&catid=2&loc=show )
5c409112e8884169960a9f6508f1a48f.gif

Also changed the Fram HP-4 oil filter.

Cu,
Sven



Cu,
Sven
 
I use Lucas oil stabilizer as well.

The new engine is already set up to have an engine oil temperature guage.

If you gave me a free Fram filter I would not use it. I have cut way too many oil filters apart in the last 20 years to even consider using one. No matter what Fram says or advertises - seeing is believing. I use Wix filters religiously on my vehicles. I use the factory Mack filters on the big truck. I recently cut a few K&N oil filters apart in the dyno room and they are high quality as well. Delco filters are/were? made by Wix but it seems that the quality has dropped on them recently, probably a request by the General to save money.
 
We run Delo 15W-40 dino in absolutely every piece of equipment and diesel vehicle we have, winter comes around i think mobil sells 0W 40 for really cold temps.
 
Synthetics are superior, without question. Once you use it in your engine you can never go back to the conventional oils or you will have problems.

The only issue with using synthetic oil in a diesel engine is this: Diesel engines get alot of carbon deposits into the crankcase that a gasoline engine never gets. The big attraction of the synthetics is of course longer service life and extended oil changes. Sometimes it is more cost effective to stick with the cheaper dino oil and change it more frequently to remove the carbon. That is a decision that you will have to make. I do not think I will bother to use the synthetic in my engine unless I win a lottery and plan on doing the oil changes at regular intervals anyway. I do use it in a couple of my gas powered vehicles.
 
I'm sorry, but I don't buy into all of that synthetic crap. One of the guys that works for me sends in the oil for evaluation in our bigger equipment and we switched to syn in a PC 300 excavator, there were no significant changes in anything other than price. Synthetic oil is more resistant to thermal and oxidative breakdown, not mechanical, simply put, when testing different oils, a tester puts a set of weights on a lever. This lever is attached in a way so it comes in contact with a bearing, (just a shaft of a motor), as pressure is applied the oil burns off and eventually with enough weight the motor stops. I have seen Dino, synthetic, additives, anything available for sale put on this machine and everything breaks down at the same point. Machine built by MSU northern in havre (diesel tech school), they travel to Ag shows with this exhibit to show people actual results. BUT, buying synthetic oil has a big advantage, you're not funding terrorism! ):h
 
"BUT, buying synthetic oil has a big advantage, you're not funding terrorism!"

Great statement.

Anyway, based on what I have read so far, the best synthetic and most popular are Amsoil AME15W040 or Schaeffer 9000 5W-40 both are PAO or Grp IV based for mail order. Mobil One Turbo Diesel Truck 5W-40 available at Wally.

Schaeffer 7000 is also very good it is a blend of PAO and Grp III (highly refined dino oil hence synthetic also).

Rotella T Synthetic is also very good for Grp III.

Then all the dino, favorite is Rotella T but a lot of people like Chevron Delo, Mobil Delvac 1300S, Valvoline Blue.

One thing to make sure is that you get a Diesel rated oil (start with "C") instead of gas only rated oil (start with "S") when you go to Wally to get your oil.
 
JMJNet said:
"BUT, buying synthetic oil has a big advantage, you're not funding terrorism!"

Great statement.

Anyway, based on what I have read so far, the best synthetic and most popular are Amsoil AME15W040 or Schaeffer 9000 5W-40 both are PAO or Grp IV based for mail order. Mobil One Turbo Diesel Truck 5W-40 available at Wally.

Schaeffer 7000 is also very good it is a blend of PAO and Grp III (highly refined dino oil hence synthetic also).

Rotella T Synthetic is also very good for Grp III.

Then all the dino, favorite is Rotella T but a lot of people like Chevron Delo, Mobil Delvac 1300S, Valvoline Blue.

One thing to make sure is that you get a Diesel rated oil (start with "C") instead of gas only rated oil (start with "S") when you go to Wally to get your oil.
Click to expand...

i'm putting that in my sig):h
 
samfraser said:
BUT, buying synthetic oil has a big advantage, you're not funding terrorism! ):h
Click to expand...

No, No, No, you are funding Alberta when using conventional Oil...:ihih:
BTT: Rotella T 15W40 Wally World is 54.xx for 5 GAL, Can Tire about the same but put it on sale quite often 15% off...
 
I've been using 0-40 full synthetic year round for years. Seems to be the ticket for me. :sifone:

Worked great in my 6.2 and just as good in the 6.5. I remember when I went to synthetic years ago, it was in winter when I did the change and wow I was simply amazed the next day on how fast the truck turned over. It was wicked cold, and that thing cranked like in summer. From that day on I have been a huge believer in full synthetic oil. Thats my story and I'm sticking to it. :thumbsup:
 
Jasonsmack said:
Once you use it in your engine you can never go back to the conventional oils or you will have problems.
Click to expand...


i've heard that this was just a rumor. then again i've also heard its true. i'm no oil expert but i don't know what to believe personally.
 
The truth about synthetics... They are great however they are still a petrolium based product. I have a friend who works for cheveron and he said besides the additional addatives in the synthetic the only other difference is the size of the molecules. I don't remember the actually size of the molecules but synthetic doesn't have a molecule size greater than 3. (I don't remember what the # in the size means) The standard oils can have sizes anywhere up to 15. The smaller molecules allow it to flow more freely.
 
Wikipedia has a good article on the types, uses, advantages and disadvantages of synthetic oil,
here

Little video clip from DrivingTV..


Try not to imagine her all oily... :)
 
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