The Ford Barn

Steves46 · 03-17-2024, 10:13 AM

Has anyone added Barr's or Lucas oil stop leak products to their engine oil? Did it help to a degree with any leaks? I tried checking previous threads but couldn't locate anything specifically addressing this. Thanks.

katy · 03-17-2024, 10:28 AM

Oil stop leak products are for engines w/synthetic material seals, like neoprene for example. With age and heat the seals tend to stiffen up, lessening there ability to seal against the moving (revolving) part. The "oil stop leak" softens up the sealing materiel. It won't help if the parts are worn, causing the oil to leak out the excessive clearance.
I doubt that they would work on a Model A with "old timey" seals.

The Master Cylinder · 03-17-2024, 11:35 AM

Quote:

Originally Posted by katy

I doubt that they would work on a Model A with "old timey" seals.

Or no 'seal' at all like the rear main.

nkaminar · 03-17-2024, 03:11 PM

A little bit of oil leak is fairly common. Lots means it needs fixing.

ronn · 03-17-2024, 03:23 PM

I prefer mine with the fixins!

Jyromefedx · 03-17-2024, 08:30 PM

Sponsored Links (Register now to hide all advertisements)

The main question is where the oil comes from and then determine how important/ necessary it is to fix. Rear seal YES, Valve cover, MAYBE?

jeepguy1948 · 03-17-2024, 09:39 PM

(A) Most Model A motor’s are happiest about a 1/2 quart less oil than the dipstick indicates. I would suggest that you stop adding oil until it gets that level or even a bit lower. If it keeps leaking after that then it’s time to did deeper. (B) Since there is no rear main seal if you park facing uphill the oil is going to drain out the back just like it will if you overflow the bathtub.

nkaminar · 03-18-2024, 05:26 AM

I never fill my bathtub with oil.

Steves46 · 03-18-2024, 06:01 AM

Thanks for the inputs Gents. I believe the issue is the rear main leak from a full dispatch. Will keep it at least half full on the stick.

marty in Ohio · 03-18-2024, 08:19 AM

The old Model A adage is "if it ain't leakin' it's empty."
Marty

The Master Cylinder · 03-18-2024, 08:55 AM

Quote:

Originally Posted by jeepguy1948

Since there is no rear main seal if you park facing uphill the oil is going to drain out the back just like it will if you overflow the bathtub.

Quote:

Originally Posted by nkaminar

I never fill my bathtub with oil.

I bet you don't park your bathtub facing uphill either.

Phil Brown · 03-18-2024, 10:41 AM

Agreed with the above info on a stock set-up A, but if you have a modern-type rear seal that drips a little or your modern ride leaks 3-4 oz of regular brake fluid in the crankcase (with the motor oil) will swell the seals enough to stop your leak most times.
No need to waste your money on expensive oil stop leak additive, grandpa knew all of the tricks

03-17-2024, 10:13 AM	#1
Steves46 Senior Member Join Date: May 2010 Location: Lithia, FL Posts: 1,050	Stop Leak Has anyone added Barr's or Lucas oil stop leak products to their engine oil? Did it help to a degree with any leaks? I tried checking previous threads but couldn't locate anything specifically addressing this. Thanks. __________________ If it aint broke, don't fix it!

03-17-2024, 10:28 AM	#2
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,046	Re: Stop Leak Oil stop leak products are for engines w/synthetic material seals, like neoprene for example. With age and heat the seals tend to stiffen up, lessening there ability to seal against the moving (revolving) part. The "oil stop leak" softens up the sealing materiel. It won't help if the parts are worn, causing the oil to leak out the excessive clearance. I doubt that they would work on a Model A with "old timey" seals. __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

03-17-2024, 03:11 PM	#4
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,900	Re: Stop Leak A little bit of oil leak is fairly common. Lots means it needs fixing. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

03-17-2024, 03:23 PM	#5
ronn Senior Member Join Date: Feb 2011 Location: NNNNNNNNJJJJJJJJJJ Posts: 6,792	Re: Stop Leak I prefer mine with the fixins!

03-17-2024, 08:30 PM	#6
Jyromefedx Junior Member Join Date: Mar 2024 Posts: 13	Re: Stop Leak Sponsored Links (Register now to hide all advertisements) The main question is where the oil comes from and then determine how important/ necessary it is to fix. Rear seal YES, Valve cover, MAYBE?

03-17-2024, 09:39 PM	#7
jeepguy1948 Senior Member Join Date: Jan 2022 Posts: 721	Re: Stop Leak (A) Most Model A motor’s are happiest about a 1/2 quart less oil than the dipstick indicates. I would suggest that you stop adding oil until it gets that level or even a bit lower. If it keeps leaking after that then it’s time to did deeper. (B) Since there is no rear main seal if you park facing uphill the oil is going to drain out the back just like it will if you overflow the bathtub.

03-18-2024, 05:26 AM	#8
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,900	Re: Stop Leak I never fill my bathtub with oil. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

03-18-2024, 06:01 AM	#9
Steves46 Senior Member Join Date: May 2010 Location: Lithia, FL Posts: 1,050	Re: Stop Leak Thanks for the inputs Gents. I believe the issue is the rear main leak from a full dispatch. Will keep it at least half full on the stick. __________________ If it aint broke, don't fix it!

03-18-2024, 08:19 AM	#10
marty in Ohio Senior Member Join Date: May 2011 Location: Elyria, Ohio Posts: 757	Re: Stop Leak The old Model A adage is "if it ain't leakin' it's empty." Marty

03-18-2024, 10:41 AM	#12
Phil Brown Senior Member Join Date: May 2010 Location: Santee Calif. Posts: 509	Re: Stop Leak Agreed with the above info on a stock set-up A, but if you have a modern-type rear seal that drips a little or your modern ride leaks 3-4 oz of regular brake fluid in the crankcase (with the motor oil) will swell the seals enough to stop your leak most times. No need to waste your money on expensive oil stop leak additive, grandpa knew all of the tricks