Best Oil to Use
Thread Starter
Instructor
Joined: Feb 2011
Posts: 234
Likes: 15
Best Oil to Use
What is the best oil to use? I have a 1975 all stock small block with over 100,000 miles. Was using GTX High Mileage Synthetic, but was told to use Mobil 1 Full Synthetic 15W-50 duel to high ZDDP. Is this the correct oil to use? Don't want to damage the engine now that it is running nice.
Thanks.
Thanks.
Melting Slicks
Joined: Aug 2001
Posts: 3,046
Likes: 124
From: Wichita KS
What is the best oil to use? I have a 1975 all stock small block with over 100,000 miles. Was using GTX High Mileage Synthetic, but was told to use Mobil 1 Full Synthetic 15W-50 duel to high ZDDP. Is this the correct oil to use? Don't want to damage the engine now that it is running nice.
Thanks.
Thanks.
Le Mans Master
Joined: Sep 2004
Posts: 5,116
Likes: 5
From: Livonia MI
As mentioned, this topic has come up quite often. Zinc levels have been cut back from modern oils, because said piston ring blow by could damage cat converters, and mostly roller tappets now. Older flat tappet engines seem to like a little more zinc, for better lubrication. Oil manufacturers get around this, by marketing race oils. Probably not a bad idea, using high zinc Valvoline VR-1 racing oil, or Joe Gibbs.
Melting Slicks
Joined: Dec 2008
Posts: 2,070
Likes: 5
From: N.Richland Hills Texas
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
This gets brought up every couple weeks. Use automobile oil not deisel or motorcycle oil. There is a stickey at the top of the tech and performance page. Correct oils are listed there. Use the correct viscocity for your car 10W-40 for a higher mileage engine in good running condition should be fine.
