oil 15w40
Thread Starter
Race Director
Joined: Aug 2004
Posts: 14,639
Likes: 39
From: Winston-Salem North Carolina
St. Jude Donor '08-'09
oil 15w40
I had a friend order in a case of amsoil for me. I thought I was getting 10w50, but he ordered 15w40. I'm going to Watkins Glen tomorrow and I'm changing the oil tonight. Should I use the 15w40, or just use the mobil 1 5w30?. I had mobil1 5w30 in the car last month at wgi and saw oil temps of 305, I'm hoping to keep it a little lower with the 15w40.
Racer
Joined: Nov 2002
Posts: 412
Likes: 1
From: CT
Originally Posted by GeorgeZNJ
...I had mobil1 5w30 in the car last month at wgi and saw oil temps of 305, I'm hoping to keep it a little lower with the 15w40.
I can't really comment on your original question though... I have a hot-rod of sorts and I have higher oil pressure and lower oil temp with 20w50 racing oil than 10w40 conventional oil. If I were tracking my car, I'd probably put a heavier oil in it. Makes sense to me - Bruce
Last edited by brucemoose2; Sep 16, 2006 at 08:09 PM.
"AlohaC5" Senior Member
Joined: Jun 2003
Posts: 3,562
Likes: 44
From: Madison, AL
I run Mobil 5w40 for HPDE events and found it superior to 5w30 during the summer while on the track. Personally, I think a w50 would be too thick. While I have no experience running 15w40; I would think that would be fine.
Burning Brakes
Joined: Dec 2000
Posts: 993
Likes: 5
From: Cincinnati Ohio
Originally Posted by GeorgeZNJ
I had a friend order in a case of amsoil for me. I thought I was getting 10w50, but he ordered 15w40. I'm going to Watkins Glen tomorrow and I'm changing the oil tonight. Should I use the 15w40, or just use the mobil 1 5w30?. I had mobil1 5w30 in the car last month at wgi and saw oil temps of 305, I'm hoping to keep it a little lower with the 15w40.
Melting Slicks
Joined: May 2000
Posts: 2,498
Likes: 4
From: Brentwood TN
Originally Posted by GeorgeZNJ
I had a friend order in a case of amsoil for me. I thought I was getting 10w50, but he ordered 15w40. I'm going to Watkins Glen tomorrow and I'm changing the oil tonight. Should I use the 15w40, or just use the mobil 1 5w30?. I had mobil1 5w30 in the car last month at wgi and saw oil temps of 305, I'm hoping to keep it a little lower with the 15w40.
I think an oil cooler should be in your near future.
Charlie
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
I use 15-w50 March though Dec. and 0-w40 in Feb. with oil cooler and accu-sump
305 temp is way too high. Yes the oil can take that temps but the internal engine parts can not.
The magic number is 260. You start to see 260 and then short shift of slow down to get that oil temp down below 250.
If you track your car severl times a year, an oil cooler is highly advised to keep those oil temps 250 and under.
No the 50 weights have a far high heat shear rating, where 30 wt is broken down.
305 temp is way too high. Yes the oil can take that temps but the internal engine parts can not.
The magic number is 260. You start to see 260 and then short shift of slow down to get that oil temp down below 250.
If you track your car severl times a year, an oil cooler is highly advised to keep those oil temps 250 and under.
No the 50 weights have a far high heat shear rating, where 30 wt is broken down.
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