Stop Oil Leak Juice

[ThePenIsMightier]

I assume zero of these work, but if you know of one that at least half-ass works, please let me know. My friend needs to buy some time before looking into this repair in the spring.

[ExtraSlow]

If the car is leaking a little, these can help it leak a little less.
Once upon a time I used the Lucas stuff in the 1 quart bottle and though I got some improvement.

Same idea as some "high mileage oil" honestly.

If it's leaking more than a little. Probably no hope.

[firebane]

If its leaking bad enough you think you need a "fix in a bottle' the fix isn't going to work

[mr2mike]

I did some engine work on a motor that the headgasket had been leaking. They put stop leak in the coolant.
That sufficiently plugged the water ports in the block.
Vehicle overheated constantly after that.
I suspect the rad was also very plugged.

In the oil, not sure what happens.
Either way, engine work in near future. Worth a shot but don't be disappointed if it doesn't work 100%

[ExtraSlow]

I THINK (but can't prove) that there are fewer risks to using stop-leak in the oil rather than in the coolant. That being said, I agree it's a short term solution at most.

[mr2mike]

Well, for one, you can easily flush your oil compared to flushing coolant and the radiator replacement is a pain for most of society.

[Flexray]

Personally, I would not put any type of stop leak or fluid additive in any of my vehicles.

As seals age, they get brittle and shrink causing them to leak. Oil based stop leaks have an additive that causes the seals to swell. The concept is to expand the seal so it stops leaking. Coolant based stop leaks will build up a gooey material that plugs everything. I have seen stop leak in cooling systems write off vehicles.

Stop leak will expand any seal or gasket that oil touches and will keep on expanding them until they get too big and start leaking again. It may also expand other non-leaking seals causing them to also start leaking. I'm sure the instructions on the bottle will say something along the lines of: dump product in, drive vehicle until the leak stops, then change the oil.

I would plan on replacing every seal and gasket on the engine after stop leak is used.

[ShermanEF9]

The problem with the temp fixes in a bottle is they usually make a mess that is much more work to fix later on. If it were between using a stop leak, and checking my oil more often... I'll keep checking it until I can fix it correctly.

[DonJuan]

I've used the Lucas stop leak in the oil before and running much thicker oil also which may have fixed it temporarily.

This was also on various winter beaters that I didn't keep past winter (even worked on a rear main seal). So may be time to dump some in and trade in.

Coolant stop leak is a BAD idea. I've never seen that end well.

[Hallowed_point]

Save your money. I've tried Blue Devil , STP etc on my 97 Camaro seeping rear main seal. Zero results. I think there are very limited situations where you'd want to use a stop leak, except in an emergency in a rural area etc to get you home and possibly slow down a leak slightly.