View Poll Results: Preferred Oil Viscosity
Voters: 120. You may not vote on this poll
Oil Viscosity
#1
Banned. I got OWNED!!!
Thread Starter
Join Date: Jul 2008
Location: NC
Posts: 529
Likes: 0
Received 0 Likes
on
0 Posts
Oil Viscosity
Turbocharged rotaries have to be one of the most severe environments for engine oil in the world: ungodly fuel dilution, blow-by, extreme heat, and high rpm turbine abuse. Alot of the members here are running 15w-50 to offset some of the fuel dilution issues, but is it really necessary? How is apparent viscosity affected? I'm posting a poll, but would also like to hear from those who have evaluated % fuel dilution and apparent viscosity via UOA...thanks
#2
Banned. I got OWNED!!!
Thread Starter
Join Date: Jul 2008
Location: NC
Posts: 529
Likes: 0
Received 0 Likes
on
0 Posts
Not many aspiring Tribologists here I take it I find this topic fascinating (and a little discouraging, because I've never seen an oil look as nasty and thin so fast as it does in an FD)
#7
Banned. I got OWNED!!!
Thread Starter
Join Date: Jul 2008
Location: NC
Posts: 529
Likes: 0
Received 0 Likes
on
0 Posts
Trending Topics
#8
TANSTAFL
iTrader: (13)
Ever change a diesel vehicle's oil? Nastiest stuff you've ever seen, right? Filthy even after the change ... but they can go half a million miles or more with that dirty oil.
If you're sweating what your oil looks like, I wouldn't. Just pre-mix and be done with it. How many 13B's are having bearing failures and how many aren't getting enough seal lubrication?
Bump for UOAs.
#9
Banned. I got OWNED!!!
Thread Starter
Join Date: Jul 2008
Location: NC
Posts: 529
Likes: 0
Received 0 Likes
on
0 Posts
How many 13B's are having bearing failures and how many aren't getting enough seal lubrication?
#10
Banned. I got OWNED!!!
Thread Starter
Join Date: Jul 2008
Location: NC
Posts: 529
Likes: 0
Received 0 Likes
on
0 Posts
although not specific to the FD, this guy shares my philosophy in why it's important to run a high viscosity oil in these engines
http://www.bobistheoilguy.com/forums...76#Post1335676
http://www.bobistheoilguy.com/forums...76#Post1335676
With this direct injected, turbocharged, high specific output motor, I would stick with synthetic, and the most robust synthetic I could afford. If fuel dilution stays high, I might also mix in a quart or two of something higher viscosity so the final visc. stays at least in the 30wt range.
#15
Banned. I got OWNED!!!
Thread Starter
Join Date: Jul 2008
Location: NC
Posts: 529
Likes: 0
Received 0 Likes
on
0 Posts
I should have included another category for 20w-50, that seems to comprise the majority of the "other"
I'm going to try Amsoil 20w-50 next oil change...for those of you running it, what oil pressures are you seeing when cold? they have to be up there
I'm going to try Amsoil 20w-50 next oil change...for those of you running it, what oil pressures are you seeing when cold? they have to be up there
#16
Senior Member
iTrader: (12)
http://www.mobil.com/USA-English/Lub...cycle_Oils.asp - Mobil 1
http://www.ilacorp.com/images/web_20w50.pdf - Idemitsu
http://www.schaefferoil.com/datapdf/705.pdf - Schaeffer
http://www.amsoil.com/storefront/aro.aspx - Amsoil
http://www.castrol.com/liveassets/bp...tEvoXTra4T.pdf - Castrol
Based off the information from these PDS (product data sheets) imo i can see idemitsu as rotary specific oil because it keeps a high viscosity and flash point. Amsoil is the next best because of its high viscosity and it keeps a high flash point almost equal to that of idemitsu. Mobil one would be my third choice because its the opposite of amsoil it has the highest flash point while keeping a viscosity almost equal to idemitsu. This is only 20w50 oils and i know viscosity and flash points aren't all there is to oil but i figured them to be important especially since this post was asking about viscosity.
This is all IMO the only real way to prove this is with multiple UOAs. heh Which i dont have
http://www.ilacorp.com/images/web_20w50.pdf - Idemitsu
http://www.schaefferoil.com/datapdf/705.pdf - Schaeffer
http://www.amsoil.com/storefront/aro.aspx - Amsoil
http://www.castrol.com/liveassets/bp...tEvoXTra4T.pdf - Castrol
Based off the information from these PDS (product data sheets) imo i can see idemitsu as rotary specific oil because it keeps a high viscosity and flash point. Amsoil is the next best because of its high viscosity and it keeps a high flash point almost equal to that of idemitsu. Mobil one would be my third choice because its the opposite of amsoil it has the highest flash point while keeping a viscosity almost equal to idemitsu. This is only 20w50 oils and i know viscosity and flash points aren't all there is to oil but i figured them to be important especially since this post was asking about viscosity.
This is all IMO the only real way to prove this is with multiple UOAs. heh Which i dont have
#18
Long time on-looker
iTrader: (33)
same here, but use 10w-40. As I'm sure you've read on bobistheoilguy the newer direct injected engines are seeing strong fuel dillution as well and I'm doubting what they're seeing is as much as most rotaries have. I don't feel it's worth it to spend big bucks on a synthetic if I'm not sure that it'll still live up to this issue, and I'm sure as crap not using Amsoil and changing every 1000 miles.
goood thread, even though it's been discussed in the past it's nice to see continued thought put into the subject.
and yes Dave I'm still on the edge of my seat waiting for you to follow thru with your testing!
goood thread, even though it's been discussed in the past it's nice to see continued thought put into the subject.
and yes Dave I'm still on the edge of my seat waiting for you to follow thru with your testing!
#20
Banned. I got OWNED!!!
Thread Starter
Join Date: Jul 2008
Location: NC
Posts: 529
Likes: 0
Received 0 Likes
on
0 Posts
I can see idemitsu as rotary specific oil because it keeps a high viscosity and flash point. Amsoil is the next best because of its high viscosity and it keeps a high flash point almost equal to that of idemitsu. Mobil one would be my third choice because its the opposite of amsoil it has the highest flash point while keeping a viscosity almost equal to idemitsu.
#22
Constant threat
I was just thinking this same thing the other day whilst investigating my oil leak. My oil has MAYBE 1500 miles on it and...yechhhh.
And I have had diesel engines....I think the rotary's looks worse. It just looks...unhealthy or something. Like oil with leukemia....