D24T.com  

Go Back   D24T.com > Technical Discussion Area > Diesel Engine and Drivetrain

Reply
 
Thread Tools Display Modes
  #1  
Old 12-09-2009, 08:25 AM
myselfnjit myselfnjit is offline
Member
 
Join Date: Jun 2009
Location: Owego, NY
Posts: 57
Default What oil?

Just changed the oil with the usual 15-40 but got to thinking up here in the cold NY winters, should I use something else?
What does everyone use/ recommend?

Steve
__________________
1986 Volvo 740TD Wagon, WVO 200k+ running strong!
2003 VW Jetta Wagon TDI, Mufflerectomy, CCV Mod, 100K
Reply With Quote
  #2  
Old 12-09-2009, 09:15 AM
Jason's Avatar
Jason Jason is offline
Owner/admin
 
Join Date: Jun 2009
Location: St.Louis, MO
Posts: 1,248
Default

You should be using diesel rated synthetic like 5w-40. I'm using 5w-40 blue bottle Rotella as its the least expensive of the diesel sythetic 5-40s. The engine seems to quite out quickly in the cold weather and the cold flow characteristics are much better than the 15w-40. The 5-40 can be run in the summer to, but if you want to run a 15-40 you should still run synthetic.

Jason
__________________

SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped
9.90@71mph in the 1/8th, 2.2 sec 60' (burning tires off through 1st gear)
My engine build: http://www.d24t.com/showthread.php?t...t=engine+build
T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics!
Reply With Quote
  #3  
Old 12-09-2009, 05:14 PM
myselfnjit myselfnjit is offline
Member
 
Join Date: Jun 2009
Location: Owego, NY
Posts: 57
Default

Well that sure is going to bring the price of an oil change up!!
I change mine often so I guess it will be synth next time.
Question though: Will synth leak more? I have some pretty good seapage right now that I would hate to make worse.

Steve
__________________
1986 Volvo 740TD Wagon, WVO 200k+ running strong!
2003 VW Jetta Wagon TDI, Mufflerectomy, CCV Mod, 100K
Reply With Quote
  #4  
Old 12-09-2009, 08:17 PM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Livingston, MT
Vehicle: '86 745, '83 764
Posts: 1,389
Default

15W40 non-synthetic is the worst thing you could possibly run in the wintertime, especially in NY where the weather gets cold. It guarantees rapid engine wear.

In a D24T the oil should ALWAYS be synthetic, and in the wintertime it had better be 5W30 or 5W40. I am running AMSoil Series 3000 5W30 this winter and used it last summer as well, though I'll probably switch to their 5W40 or 15W40 next summer.

It brings the price up at oil change time, but since you only need to change it about 1/3 as often the overall price ends up about the same. How often are you changing it now? Every 7500-10,000 miles is fine if you are running a high-quality synthetic. Rotella Syn is good stuff but it's toward the bottom of the chain. Mobil 1 Delvac is good, Lubro-Moly makes some good stuff, and AMSoil is the best but it does get expensive. Anything that is synthetic, rated for diesel use (capable of handling soot and high temps), and the right viscosity range will be better than what you are running now. Use a good filter as well -- Mann, Mahle, or WIX. Do not use a Fram or other low-budget filter. Cheap crappy filters are false economy -- the few bucks extra you spend getting a quality filter will save you thousands in the long run.

Synthetic will NOT make the engine leak more. That is a myth that arose in the 1980s with very early primitive synthetic oils. It has not been an issue for decades, but somehow the myth hangs on. It is false. Synthetic will do nothing but good for your engine, in every way.
__________________
86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
Reply With Quote
  #5  
Old 12-10-2009, 04:10 AM
myselfnjit myselfnjit is offline
Member
 
Join Date: Jun 2009
Location: Owego, NY
Posts: 57
Default

I change every 3-4k because I run WVO in the car and dont want any Veg that might happen to make it into the crankcase to polymerize.

Well I just changed the oil...
Cant afford another one right now but when I can I guess it will be a 5w30 or 5w40 synth.
__________________
1986 Volvo 740TD Wagon, WVO 200k+ running strong!
2003 VW Jetta Wagon TDI, Mufflerectomy, CCV Mod, 100K
Reply With Quote
  #6  
Old 12-10-2009, 04:29 AM
Jason's Avatar
Jason Jason is offline
Owner/admin
 
Join Date: Jun 2009
Location: St.Louis, MO
Posts: 1,248
Default

The blue bottle Rotella is a good oil, ya maybe not as good as Amsoil, but its still a full synthetic. Wal-mart has it for $19 a gallon. With your veg oil thing going on, you could still push the oil change interval to say 5000 miles. It will still be better for your engine. I change mine every 5000 but I also run the crap out of may car and blow smoke constantly so it gets pretty sooted up!

Jason
__________________

SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped
9.90@71mph in the 1/8th, 2.2 sec 60' (burning tires off through 1st gear)
My engine build: http://www.d24t.com/showthread.php?t...t=engine+build
T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics!
Reply With Quote
  #7  
Old 05-02-2021, 12:03 PM
dahicori dahicori is offline
Member
 
Join Date: Mar 2020
Location: France
Vehicle: 1981 GL 245
Posts: 42
Default

Hello everybody!!

I have to make an oil change on my 245. I didnt fix , but the guy who is going to sell me my new rack, who seems to know is way around 240 and volvo in general, told me that mineral oil could settle some of my oil leaks.

Is that true? Because it s a non-turbo diesel...or is it the still living myth V8 is talking about?

problem is I have to use the car to take a train very early in the morning, and I have no time to get some oil: a friend of mine gave me some 10W40 Motul, expensive oil (like more than three time the price of the mineral 15W40). Should i give my old 240 that very fine food? Or some cheap beverage will do better ? Thanks!
Reply With Quote
  #8  
Old 05-03-2021, 02:25 PM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Livingston, MT
Vehicle: '86 745, '83 764
Posts: 1,389
Default

The myth of different oil types causing or solving leaks is mostly a myth.

If there is a gasket that is already failing, then I suppose running a thinner or more slippery oil could increase a leak.... and on the flip side of the coin, yes there are "seal conditioner" products out there that promise to give new life to tired/brittle seals too, or thicker/worse oils.

But remember the main purpose of the oil is to lubricate and cool internal parts of the engine, not limit leaks from seals. That's the seals' job! Best choice is to use the right oil for the engine, and deal with leaks by making repairs, rather than attempting a fix in a bottle. You don't want to sacrifice anything in the primary purpose of the oil by chasing after leak mitigation, which is what you would do if you used mineral 15W40 rather than a good synthetic 5W40 or 0W40 (or some like 0W30/5W30 if you live where the weather never gets hot).

Your D24 should also be happy with the 10W40 Motul in the summertime, as long as it is rated for diesel engine operation of course. In the winter you want a 0W or 5W weight.
__________________
86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
Reply With Quote
  #9  
Old 05-08-2021, 07:21 AM
dahicori dahicori is offline
Member
 
Join Date: Mar 2020
Location: France
Vehicle: 1981 GL 245
Posts: 42
Default

ok! thanks!
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -8. The time now is 10:55 AM.


Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2021, vBulletin Solutions, Inc.