Best Motor Oil

R

RyanB

Member
I am having a struggle with which motor oil to use in my coupe engine today. It is completely rebuilt and we are adding the fluids to everything today. I would love to hear suggestions on which oil is working the best these days.

Thanks
 
oh boy the weekly can of worms has been opened.

heres the 2 suggestions:

1: MOST IMPORTANTLY - use what oil your rebuilder recomends so incase there is an issue he cant come back on you and say you used the wrong oil.

2: ANY multiweight detergent oil nowadays is 100x better than what was available in the 30's

I personally use castrol GTX conventional 10-w30 with stp oil treatment but opinions will vary greatly.

***since it sounds like this is the first time the engine will be ran put in the cheapest multiweight detergent oil around as it would be wise to change the oil after 100 miles or so to get all the grit from things wearing in out of the engine.
 
Pour a little oil down each cylinder and down the distributor hole before you fire it up so you have some lube in the top end.
There are also oils especially formulated for new engine breakin. My rebuilder recommended that for my last engine, though I didn't notice any difference from just using 10-30 and changing it regularly after the first 100 miles in earlier rebuilds.
 
Eh oh...

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I too use Castrol GTX but 20w50, only because I buy it by the case for my M/C's. No additives.
 
Last edited:
700rpm said:
Pour a little oil down each cylinder and down the distributor hole before you fire it up so you have some lube in the top end.
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oh yea this too, pour a quart down the distributor hole so it fills the valve chamber and gets oil to the mains and fills the splash pan so its not starved for oil on the first startup.
 
Did you ask the rebuilder??? Do a search "motor oil"...... I use 15w40 rotella.......
 

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RyanB said:
I am having a struggle with which motor oil to use in my coupe engine today. It is completely rebuilt and we are adding the fluids to everything today. I would love to hear suggestions on which oil is working the best these days.

Thanks
Click to expand...

The best oil is the one you use!!

The truth of the matter is any oil made for motor vehicles will work fine.
 
I go with the suggestion to ask the rebuilder. If the oil is too good the rings might not seat (or so I have read). You want to follow the advice of the rebuilder so if there are any problems you know where to point the finger.

Charlie Stephens
 
I use Rotella T in the A's and the old tractors. Diesel engines are much more demanding than any old engine.
 
Fantastic advice. I will definitely get oil on the top end before firing it up. Fingers crossed it will fire right up. The engine has not run since 1950 so this will be a neat experience. Thanks again for all the advice.
 
If the engine has not run since 1950 and it sat with oil in it there is a good chance there is a thick layer of sludge in the bottom of the pan-- many times deeper than the oil pickup
 
FWIW, Humble Opinion:

As far as the thousands of worn out, oil burning and engine knocking Model A engines witnessed by most Forum members reported over the past twenty (20) years, here are at least two (2) important Model A Oil Facts that applies to "all" engines:

1. Immediately after "paying" for an engine rebuild, "everybody" is so very concerned "which" type of oil to use ....... to avoid having to pay soon ...... for another engine rebuild.

2. Then, not too long afterwards, "most" harmful engine wear is caused "not" " by which" oil was chosen ............... but ............. by this same or a subsequent "cheap" Model A owner not wanting to "pay" for providing fresh, clean oil as often as recommended.
 
you gave the impression in the original post the engine had just been rebuilt and not 65 years ago as you now state. Incomplete posts result in incomplete or erroneous answers. Wayne
 
H. L. Chauvin said:
FWIW, Humble Opinion:

As far as the thousands of worn out, oil burning and engine knocking Model A engines witnessed by most Forum members reported over the past twenty (20) years, here are at least two (2) important Model A Oil Facts that applies to "all" engines:

1. Immediately after "paying" for an engine rebuild, "everybody" is so very concerned "which" type of oil to use ....... to avoid having to pay soon ...... for another engine rebuild.

2. Then, not too long afterwards, "most" harmful engine wear is caused "not" " by which" oil was chosen ............... but ............. by this same or a subsequent "cheap" Model A owner not wanting to "pay" for providing fresh, clean oil as often as recommended.
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Since when are model A owners cheep:eek:;);):D
 
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