Hi,
Thanks for adding me to this group J
I just have assembled my engine after major overhaul, including boring of cylinders and have to decide what engine oil I am going to run.
It is a 1953 Willys Overland Jeep CJ3B with an F134 engine. 4 side valves and 4 overhead valves, with flat tappets. It will be used now and then, but the temperature alternations here in Norway are considerable -20℃ to 30℃. Will not be used as my everyday vehicle.
Specification from service manual 1965:
Not lower than 32 F. (0 C.) use SAE 30 or 10W-30
Not lower than 10 F.~ 12 C) use SAE 20, 20W. lOW-30, or lOW-20
As low as 10 F. (-23 C.) use SAE l0W, l0W-30, or 10W-20
Below 10 F. ( -23 C.) use SAE 5W or 5W-20
From this it seems like 10W-30 is the obvious choice, but isn’t it better to use SAE 10W-40 or even SAE 5W-40 to benefit from the newer technology that gives better viscosity index?
This is an engine with flat tappets and what I have learned long time ago is that high level of ZDDP additives like Zink is necessary on engines of this type, is that still true or is the ZDDP additives replaced by something else in modern engine oils?
The high level ZDDP oil I have used in the past is now replaced with Fuchs TITAN UNIVERSAL HD SAE 15W-40.
What experience do people in here have with engine oil for vintage cars?
Thanks for adding me to this group J
I just have assembled my engine after major overhaul, including boring of cylinders and have to decide what engine oil I am going to run.
It is a 1953 Willys Overland Jeep CJ3B with an F134 engine. 4 side valves and 4 overhead valves, with flat tappets. It will be used now and then, but the temperature alternations here in Norway are considerable -20℃ to 30℃. Will not be used as my everyday vehicle.
Specification from service manual 1965:
Not lower than 32 F. (0 C.) use SAE 30 or 10W-30
Not lower than 10 F.~ 12 C) use SAE 20, 20W. lOW-30, or lOW-20
As low as 10 F. (-23 C.) use SAE l0W, l0W-30, or 10W-20
Below 10 F. ( -23 C.) use SAE 5W or 5W-20
From this it seems like 10W-30 is the obvious choice, but isn’t it better to use SAE 10W-40 or even SAE 5W-40 to benefit from the newer technology that gives better viscosity index?
This is an engine with flat tappets and what I have learned long time ago is that high level of ZDDP additives like Zink is necessary on engines of this type, is that still true or is the ZDDP additives replaced by something else in modern engine oils?
The high level ZDDP oil I have used in the past is now replaced with Fuchs TITAN UNIVERSAL HD SAE 15W-40.
What experience do people in here have with engine oil for vintage cars?