Engine Oils Weight
Thread Starter
Melting Slicks
Joined: Jul 2005
Posts: 2,545
Likes: 3
From: 406ci SB, AFR 180 Heads - 490 HP @5,600 RPM 529 lb-ft @ 4,100 RPM
Engine Oils Weight
I have just completed a complete rebuild on my 1979 350 L82 motor now producing 375 hp. It seems I getting mixed answers on which motor oil weight to use. Everything from 10w 30 to 20w 40. Since I only drive my vette during the summer with 70 to 90 daily outside temp's. I'm wondering what others are using.
Instructor
Joined: Aug 2003
Posts: 111
Likes: 0
From: South-western Ontario
I've been using 10W 30 in my '79 for 3 years now with no problems. I drive the car about 4000 miles/year (around mid April to end of October) and change the oil/filter about now then just before I retire the car for the winter.
Melting Slicks
Joined: Aug 2003
Posts: 2,135
Likes: 2
From: Dayton Oh
Originally Posted by Glass Act
I have just completed a complete rebuild on my 1979 350 L82 motor now producing 375 hp. It seems I getting mixed answers on which motor oil weight to use. Everything from 10w 30 to 20w 40. Since I only drive my vette during the summer with 70 to 90 daily outside temp's. I'm wondering what others are using.
Anyways, as everyone has suggested, the 10W30 or 10W40 is a good range for the situation you're asking about. Be sure to only use non-synthetic for the 1st 2K miles to ensure your rings get run in.
Burning Brakes
Joined: Jun 2002
Posts: 837
Likes: 3
From: Texas
Originally Posted by zwede
Yes, fully synthetic. I go 6-7k miles. Could go more miles but that is about a years driving and I don't want to go over a year between changes.
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Race Director
Joined: Sep 1999
Posts: 11,361
Likes: 383
From: Plano TX
Oh, I wouldn't think twice about going 15-20k miles on M1 or any other high quality synthetic. But besides miles, time also breaks down the additive package and contaminates the oil and everything Ive heard says you want to change it every year.
I use a one quart filter. Used to run the PF35 until it got replaced with the PF1218. Ran that until recently changed the 1218 to a cheap piece of junk. Currently using some PF35L's I found. Not sure
what I'll use once the PF35L's are gone.
I use a one quart filter. Used to run the PF35 until it got replaced with the PF1218. Ran that until recently changed the 1218 to a cheap piece of junk. Currently using some PF35L's I found. Not sure
what I'll use once the PF35L's are gone.
Burning Brakes
Joined: Jun 2002
Posts: 837
Likes: 3
From: Texas
Markus, this is the forum I was speaking of if you're interested.
http://theoildrop.server101.com/cgi/ultimatebb.cgi
Pretty interesting place......they do a lot of testing and comparing.
http://theoildrop.server101.com/cgi/ultimatebb.cgi
Pretty interesting place......they do a lot of testing and comparing.
