Why 20W50 oil?
Senior Member
Joined: Jan 2002
Posts: 675
Likes: 0
From: USA
Originally posted by Nathan Kwok
I hear the 20w50 recommendation all the time too. But if this is best, why does Mazda recommend 10w30 (5w30 in the winter!!!)? Thats the part I don't get.
I hear the 20w50 recommendation all the time too. But if this is best, why does Mazda recommend 10w30 (5w30 in the winter!!!)? Thats the part I don't get.
royal purple 20w50
Thread Starter
Old [Sch|F]ool
Joined: May 2001
Posts: 12,865
Likes: 571
From: Cleveland, Ohio, USA
I've heard of people blowing oil cooler lines just by revving over 4k in the winter with 20W50 oil. The oil temps really lag behind coolant temps, so when you THINK the engine's warmed up, the oil is still thick and hard to pump.
Hey, where did my $$$ go?
Joined: Feb 2001
Posts: 4,413
Likes: 0
From: Bimingham, AL
Originally posted by RICE RACING
Things like side seal gaps, Apex seal height and chamfering still happen...the main reason for tear down is to regain the 5 to 10% or more power loss due to loss of sealing efficiency of these items.
When using lower quality oil things like main bearings, rotor gear, stationary gear, rotor lands, side housings, and notably oil control rings show alot of wear, these are the things I find that show negligable wear when using Mobil 1 5W-50.
The only thing I have found to reduce the wear of side seals, Apex seals is a good premix, richer fuel mixture, and water injection...all are good at reducing thermal load or the level of heat which accelerates the wear of these components in high HP turbo applications.
Things like side seal gaps, Apex seal height and chamfering still happen...the main reason for tear down is to regain the 5 to 10% or more power loss due to loss of sealing efficiency of these items.
When using lower quality oil things like main bearings, rotor gear, stationary gear, rotor lands, side housings, and notably oil control rings show alot of wear, these are the things I find that show negligable wear when using Mobil 1 5W-50.
The only thing I have found to reduce the wear of side seals, Apex seals is a good premix, richer fuel mixture, and water injection...all are good at reducing thermal load or the level of heat which accelerates the wear of these components in high HP turbo applications.
Hey Rice.....are you saying Mobil 1 5W-50 synthetic or mineral???
Thanks,
STEPHEN
Joined: Mar 2001
Posts: 30,804
Likes: 646
From: FL-->NJ/NYC again!
Originally posted by RedR1
thanks for the clarification, Rice Racing! Im getting a rebuild pretty soon (with streetport, etc), i'll keep the 5w-50 in mind come April.
Chris
thanks for the clarification, Rice Racing! Im getting a rebuild pretty soon (with streetport, etc), i'll keep the 5w-50 in mind come April.
Chris
Thread
Thread Starter
Forum
Replies
Last Post
troym55
3rd Generation Specific (1993-2002)
23
May 25, 2016 12:42 PM
tiger18
3rd Generation Specific (1993-2002)
9
Sep 3, 2015 08:27 PM
