5W-40 Really does work like you all say!
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
Yeah, I invested in the synthetic at the last oil change, then the alternator/GPR went the next day. Not sure which. I guess the alternator was already worn out. Then the ECM went. So of course, it's the oil right? 
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
How is the synthetic treating you?
Posting Guru
Joined: Jul 2006
Posts: 1,720
Likes: 1
Sign me up!
No more romps with 5w40 syn rotella. Smoother drive away.
What was really interesting was after I changed the oil I started the engine to check the filter for leaks as I would normally do. After about 1 minute of running the engine noticably smoothed out. I almost could not believe what I was hearing. It actually made a noticable change while I watched.
So for me in my diesel truck it is Syn Rotella.
What was really interesting was after I changed the oil I started the engine to check the filter for leaks as I would normally do. After about 1 minute of running the engine noticably smoothed out. I almost could not believe what I was hearing. It actually made a noticable change while I watched.
So for me in my diesel truck it is Syn Rotella.
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
I think even though I may not have had any symptomatic changes, the overall improvment in change interval and quality will be an improvement.
Smokin
Joined: Jun 2006
Posts: 8,849
Likes: 0
I hesitated switching to synthetic..mostly because I had heard that the thinner viscosity could lead to new oil leaks in higher mileage engines.
I switched, and I haven't had a single problem. Truck loves it. Even in cold cold Iowa, the truck hasn't romped once.
I switched, and I haven't had a single problem. Truck loves it. Even in cold cold Iowa, the truck hasn't romped once.
Elder User
Joined: Sep 2008
Posts: 595
Likes: 0
Any reason to choose the 5w-40 and not the 15w-40? Just asking because I think walmart sells it slightly cheaper than the 5w-40, and in 2.5 gallon bottles.
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Joined: Jan 2006
Posts: 5,406
Likes: 1
From: Gulf Coast of Florida
Shell Rotella in synthetic for diesels is not available in 15W40, only 5W40
Shell Rotella in dino for diesels is not available in 5W40, only 15W40
Schaeffer's has a dino diesel oil 15W40
Schaeffer's synthetic blend diesel oil is 15W40
Schaeffer's fully synthetic diesel oil is 5W40
Basically, if it's 5W40 we're talking fully synthetic. 15W40 is dino oil typically, but Schaeffer's does make that blend. Nice thing about diesel engine oil... there's not too many to choose from, not like for a gasser. Are there other diesel engine oils? SURE!! But you'd be hard pressed to find them, and then to get feedback on them. Unless you're talking about the big CAT or Detroit Diesel engines, but you won't be finding them under the hood of a PSD.
Shell Rotella in dino for diesels is not available in 5W40, only 15W40
Schaeffer's has a dino diesel oil 15W40
Schaeffer's synthetic blend diesel oil is 15W40
Schaeffer's fully synthetic diesel oil is 5W40
Basically, if it's 5W40 we're talking fully synthetic. 15W40 is dino oil typically, but Schaeffer's does make that blend. Nice thing about diesel engine oil... there's not too many to choose from, not like for a gasser. Are there other diesel engine oils? SURE!! But you'd be hard pressed to find them, and then to get feedback on them. Unless you're talking about the big CAT or Detroit Diesel engines, but you won't be finding them under the hood of a PSD.
Freshman User
Joined: Oct 2008
Posts: 37
Likes: 0
From: Colorado Springs
Switching to 5-40 syn
First post after getting lots of great info from this site!
When switching to synth oil, do you recommend changing the oil in the hpop or just let it cycle through? If so, how do you empty the hpop.
Thanks all,
Tab
When switching to synth oil, do you recommend changing the oil in the hpop or just let it cycle through? If so, how do you empty the hpop.
Thanks all,
Tab
Hotshot
Joined: Nov 2006
Posts: 11,286
Likes: 263
From: North of Greenville
No comment on the RP, but I used the Amsoil DEO 5w40 for about 13K miles and was not pleased with how the wear metals started escalating at the end. I switched to the Schaeffer's 9000 series 5w40 and have not seen the same escalation in metals, so I'm sticking with it. Furthermore, the DEO was much more expensive than the Schaeffers.
Elder User
Joined: Sep 2008
Posts: 595
Likes: 0
Shell Rotella in synthetic for diesels is not available in 15W40, only 5W40
Shell Rotella in dino for diesels is not available in 5W40, only 15W40
Schaeffer's has a dino diesel oil 15W40
Schaeffer's synthetic blend diesel oil is 15W40
Schaeffer's fully synthetic diesel oil is 5W40
Basically, if it's 5W40 we're talking fully synthetic. 15W40 is dino oil typically, but Schaeffer's does make that blend. Nice thing about diesel engine oil... there's not too many to choose from, not like for a gasser. Are there other diesel engine oils? SURE!! But you'd be hard pressed to find them, and then to get feedback on them. Unless you're talking about the big CAT or Detroit Diesel engines, but you won't be finding them under the hood of a PSD.
Shell Rotella in dino for diesels is not available in 5W40, only 15W40
Schaeffer's has a dino diesel oil 15W40
Schaeffer's synthetic blend diesel oil is 15W40
Schaeffer's fully synthetic diesel oil is 5W40
Basically, if it's 5W40 we're talking fully synthetic. 15W40 is dino oil typically, but Schaeffer's does make that blend. Nice thing about diesel engine oil... there's not too many to choose from, not like for a gasser. Are there other diesel engine oils? SURE!! But you'd be hard pressed to find them, and then to get feedback on them. Unless you're talking about the big CAT or Detroit Diesel engines, but you won't be finding them under the hood of a PSD.
Ill pick up the syn and go for it soon, thx