Race Car Tech Discuss anything related to road racing and auto X.

What grade of oil for summer auto-x?

Old 05-04-06, 04:34 PM
Drive it like ya stole it
5 Year Member
Thread Starter
Slo Motorsports's Avatar
Join Date: Feb 2006
Location: Mass
Posts: 380
Likes: 0
Received 0 Likes on 0 Posts
Question What grade of oil for summer auto-x?

We're running an FC (88, AE per signature below) in SCCA auto-x and we might do some HPDE events. We currently have 10W30 Amsoil in the car (from the winter). We are upgrading our oil cooler lines to stainless and as part of the process, we are going to change the oil. We're new to rotaries so it is important to us not to make a mistake with the grade of Amsoil we choose. Our first inclination is to use 20W50 because of the warmer weather between now and September. We are worried that it might be too heavy. Please give us your suggestions.
Slo Motorsports is offline  
Old 05-04-06, 06:15 PM
Senior Member
15 Year Member
iTrader: (2)
finky's Avatar
Join Date: Sep 2001
Location: West Michigan
Posts: 722
Likes: 0
Received 0 Likes on 0 Posts
I use Valvoline Racing 20w50 in my FD. I don't use synthetic but that is a whole debate in itself. There have been many threads on oil usage. If you search you will come across them.
finky is offline  
Old 05-04-06, 10:31 PM
Old Rotary Dog
10 Year Member
wrankin's Avatar
Join Date: Feb 2003
Location: Durham, NC
Posts: 1,461
Likes: 0
Received 2 Likes on 2 Posts
Valvoline 10w40 in the summer and changed often to avoid gas dilution. Definitely changed before each track event. I don't believe that synthetics hurt, but I consider it more important to change oil often, so I don't personally believe that synthetics would make a significant difference.

wrankin is offline  
Old 05-04-06, 11:07 PM
Panda Bear
10 Year Member
iTrader: (4)
Turbo23's Avatar
Join Date: Nov 2001
Location: Lititz, PA
Posts: 1,724
Likes: 0
Received 0 Likes on 0 Posts
Castrol GTX 20w-50 for the summer months. 10w-30 for the winter. I sometimes stick with 20w-50 all year long, because my car isnt driven as much during the winter. Thats for a turbo car though. For something NA I would say 10w-30 year round
Turbo23 is offline  
Old 05-08-06, 12:12 PM
Rotary Enthusiast
iTrader: (1)
Join Date: Jul 2004
Location: Rocket City, Alabama
Posts: 1,035
Likes: 0
Received 1 Like on 1 Post
Castrol 20x-50 is fine for street driving. In my race car, I use the Valvoline VR-1 20w-50, because it foams less at sustained hi-rpms that my peripheral port road racer stays at.
speedturn is offline  
Old 05-08-06, 12:54 PM
Full Member
5 Year Member
DaveTurnerMotorsports's Avatar
Join Date: Oct 2005
Location: San Diego, CA
Posts: 169
Likes: 0
Received 0 Likes on 0 Posts
Probably just stick with Castrol GTX 20w-50 or Valvoline VR1 race oil if this is the original engine. I have well rebuilt engine and have used cheap dino 5w-30 for break in, then Royal Purple Racing 21, and now a special German Castrol that appears like a 40-wt. The Royal Purple sample is out to Blackstone Labs for testing right now, and we'll do the Castrol in another 1K miles or so. If your Amsoil appears to be working for you, then keep using it......the GTX and VR1 seem to provide good protection and burn cleanly-- the higher flash point of the Amsoil *may* cause some housing deposits or fouled plugs, but if its working for you and oil analysis shows nice low wear and low fuel dillusion, then keep using it.

Last edited by DaveTurnerMotorsports; 05-08-06 at 12:56 PM.
DaveTurnerMotorsports is offline  
Old 05-20-06, 01:30 PM
Drive it like ya stole it
5 Year Member
Thread Starter
Slo Motorsports's Avatar
Join Date: Feb 2006
Location: Mass
Posts: 380
Likes: 0
Received 0 Likes on 0 Posts
James, where would I get an oil analysis done out here in KC country? I've never heard of that before. Please enlighten me.
Slo Motorsports is offline  
Old 06-14-06, 04:32 PM
Junior Member
5 Year Member
Join Date: Jun 2006
Location: San Diego, CA
Posts: 16
Likes: 0
Received 0 Likes on 0 Posts
Blackstone labs does oil analysis for 20 bucks a pop. Google their site
FlyPenFly is offline  
Old 06-14-06, 04:40 PM
Card-carrying Rotorhead
Unseen24-7's Avatar
Join Date: May 2006
Location: Manitoba, Canada
Posts: 457
Likes: 0
Received 0 Likes on 0 Posts
how often do you(should you) change oil, with 10w30?
Unseen24-7 is offline  
Related Topics
Thread Starter
Last Post
3rd Generation Specific (1993-2002)
01-09-18 11:19 AM
3rd Generation Specific (1993-2002)
05-25-16 12:42 PM
3rd Generation Specific (1993-2002)
09-03-15 08:27 PM
2nd Generation Specific (1986-1992)
09-03-15 07:10 PM

Thread Tools
Search this Thread
Quick Reply: What grade of oil for summer auto-x?

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: