Castrol High Mileage

[vronline]

I have recently tried Castrol High Mileage 10w-40 in an antique car with a leaky main seal. Can anyone with experience using a HM oil tell me approximately how long or how many miles I should need to go before it takes effect?

 

[UKCatsfan]

I used Castrol HM 10w40 in my 69 Chevelle last fall and ran it for about a month before storing it for the winter. I ran mobil 1 10w30 for a couple of months over the summer and it started leaking around the rear main seal pretty bad. It seams to be much better with the HM oil.

 

[Triple_Se7en]

Every leak is different. Try a whole bottle of Valvoline Stop Leak (burgundy/rust color 15 oz bottle) with regular dino if this OCI doesn't stop it.

 

[vronline]

I have already tried the Valvoline Engine Stop Leak and it didn't seem to work. I know some others on BITOG have had some luck with the Castrol HM. I've only run it about 100 miles since the change.

 

[BUBBA0420]

I have ran it in muy son's 89 Corrola with
154,000 miles on it now for the last 2 years.
The car leaks some oil and the Castrol HM has
had no effect on it whatsoever

 

[Geno]

Depends what your antique car is....Many had a rope type seal and is not affected by seal softeners/swellers.Cars of the early '30's didn't even have a rear main seal.

 

[vronline]

I image that's the issue... It's a '67 Olds Cutlass. It does seem to be running a bit smoother on this oil, so I will probably stick with a HM oil.