Ford Power Stroke Nation banner

1 - 15 of 15 Posts

·
Registered
Joined
·
752 Posts
Discussion Starter #1
Did you guys see a big difference hanging to 5w 40 full synthetic?

Slowly blend it or just drain the old 15-40 and fill it with the 5-40 synthetic?

Anyone have any bad things to say about running 5w 40 synthetic?


Sent from AutoGuide.com Free App
 

·
Registered
Joined
·
54 Posts
i personally really like 5w40. I run the rotella T6 full synthetic and a 8oz bottle of archoil ar9100 and that combination for me is golden. Before the archoil she wouldnt run right till after 10mins at 180EOT now i can pull away at 100 and not miss a beat.
 

·
Banned
Joined
·
2,444 Posts
The good:
Easier starts
Runs smoother
Slightly better throttle response.

The bad:
Costs alot! LOL

I switched all at once while I was replacing the oil cooler.
 

·
Registered
Joined
·
264 Posts
I went from motorcraft 15w40 to Amsoil Premium 5w40 in my 7.3 The first couple of oil changes I noticed I was burning about a 1.5L every 4000 miles. It seams to have stopped doing that however. Starts way easier, in this past winter at temps around the -30 celcius it would start no problem without being plugged in. It does run different until warmed up, probably has to do with the low viscosity.
 

·
Registered
Joined
·
247 Posts
I went from 15w-40 to 5w-30, Amsoil and it made huge difference. Truck starts easier runs quieter. I'm very happy.
 

·
Registered
Joined
·
269 Posts
The good:
Easier starts
Runs smoother
Slightly better throttle response.

The bad:
Costs alot! LOL

I switched all at once while I was replacing the oil cooler.
Me too
 

·
Registered
Joined
·
1,189 Posts
I've noticed no difference from running 5w 40 or 15 w 40 in my 7.3 but I'm down I fL. Vlaveoline as well
 

·
Registered
Joined
·
559 Posts
Did you guys see a big difference hanging to 5w 40 full synthetic?

Slowly blend it or just drain the old 15-40 and fill it with the 5-40 synthetic?

Anyone have any bad things to say about running 5w 40 synthetic?


Sent from AutoGuide.com Free App
I love the syn. I put the syn in right away but I only had 70k miles now I have 100k better mpg and easier starts


Sent from AutoGuide.com Free App
 

·
International Coal Roller
Joined
·
383 Posts
All the 6.0's I've ever worked on I recommended syn oil, that engine just likes synthetic, pretty whatever brand you use is gonna run better than dino, now on a 7.3 I didn't notice really any difference other than a little faster on cold starts
 

·
EA - Eggfarts Anonymous!
Joined
·
18,847 Posts
went from motorcraft 15-40 to 5-40 t6 (all at once)
-immediately noticed smoother starts!
-lightly faster drop from high to normal idle
-tad bit quieter maybe? (could be in my head)

idgaf if this is an old thread :p
 

·
Registered
Joined
·
104 Posts
went from motorcraft 15-40 to 5-40 t6 (all at once)
-immediately noticed smoother starts!
-lightly faster drop from high to normal idle
-tad bit quieter maybe? (could be in my head)

idgaf if this is an old thread :p
I know it's an old thread, but yeah my experience is the same as Turd-250. No way to tell for sure whats going on inside, but I am convinced by sound and feel that T6 is doing a better job for my engine.
 

·
Registered
Joined
·
1,069 Posts
I run T6 5w40 and ar9100 truck loves it
 
1 - 15 of 15 Posts
Top