1956 312 best Oil type

Joined
Apr 15, 2021
Thunderbird Year
56
My dad just got a 56 with a 312 and a automatic transmission. What type of oil is recommended? Any help is appreciated. I read he should use rottela t 15-40 becaue it has zinc . Not sure if that is what we need?
 

biddle

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Joined
Mar 9, 2003
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57tbird57

Active Member
Joined
May 3, 2019
Thunderbird Year
1957
My dad just got a 56 with a 312 and a automatic transmission. What type of oil is recommended? Any help is appreciated. I read he should use rottela t 15-40 becaue it has zinc . Not sure if that is what we need?
That is what i have been reading lately. I had been running quaker stated or mobil 1 synthetic.
 
Joined
Jan 1, 2018
Thunderbird Year
1969
I don't think you want such heavy weight oil in a gasoline engine. 15w40 is usually used in diesel engines. 10w30 with a ZDDP additive should do you well enough to protect flat tappet lifters.
 
Joined
Aug 21, 2019
Thunderbird Year
1955
My dad just got a 56 with a 312 and a automatic transmission. What type of oil is recommended? Any help is appreciated. I read he should use rottela t 15-40 becaue it has zinc . Not sure if that is what we need?
I use the 15W-40 (Shell is good, but other types basically the same) oil and have had really good luck and performance with it. Should be good for you!!
 
Joined
Dec 12, 2020
Thunderbird Year
1956
A noted Yblock engine builder does not recommend using the Rotella or any diesel oil in a YBlock because of the different additives in diesel oil. He uses mostly Valvoline 10-30 or 10-40 conventional in his builds.
 
Joined
Aug 14, 2019
Thunderbird Year
1957
A noted Yblock engine builder does not recommend using the Rotella or any diesel oil in a YBlock because of the different additives in diesel oil. He uses mostly Valvoline 10-30 or 10-40 conventional in his builds.
What could go wrong? On an old running engine I'd use the best additives available. A new rebuild, I could see that.
 

doug7740

Active Member
Joined
Dec 29, 2014
Thunderbird Year
1955
A noted Yblock engine builder does not recommend using the Rotella or any diesel oil in a YBlock because of the different additives in diesel oil. He uses mostly Valvoline 10-30 or 10-40 conventional in his builds.
I have used Shell Rotella T 15W-40 ever since I purchased my 1955 Thunderbird in 2014. Since then I have put about 8.000 miles on the car and have never had any problems. I change the oil and filter every year before I put the car into storage for the winter and I do not add ZDDP.

I am not a noted Y block engine rebuilder, but I have rebuilt a few Y blocks and have always used Shell Rotella T 15W-40 in those engines without any problems.


doug7740
1955 Thunderbird Blue
 

Tater Salad

Active Member
Joined
Sep 29, 2018
Thunderbird Year
1955
A noted Yblock engine builder does not recommend using the Rotella or any diesel oil in a YBlock because of the different additives in diesel oil. He uses mostly Valvoline 10-30 or 10-40 conventional in his builds.
Reference to which or what y block builder?
 

Tater Salad

Active Member
Joined
Sep 29, 2018
Thunderbird Year
1955
I don't want to use his name because I haven't asked his permission. But he is in Texas
No worries, I just didn't understand why anyone who understood flat tappet engines wouldn't advise there clients to use a higher ZDDP level than the new regulated engines.
 
Joined
Aug 14, 2019
Thunderbird Year
1957
Each to their own. As long as it lubricates, that is the issue. My classic car Mech who deals with mostly Early Mustangs also recommends 'Sea Foam' additive. Apparently it's very slippery stuff.
 
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