STP High Mileage Oil Treatment + Stop Leak - 15 FL OZ

Stuff WORKS, plain and simple. Combine it with semi synthetic or full conventional for best results.

i bought this because it has ZDDP, which my old engines require, and it has a seal additive to help reduce leaks which can be common in old engines. So this is a great product because it claims to deal with two issues. I will continue to buy this.

This product works as the seller say it do

This one works for me. I had tried the stop oil leak in the white bottle and various 'high mileage' oils - all worked to a limited degree but STP stopped my oil leak. Now that I've recently changed oil with fresh and added a new filter I'll wait for the level to drop amd add another pint of STP. My vehicle is a 2004 F150 with about 260K miles on it.

Stopped oil leak

STP is always a good product.

Works as expected

So my car is a `96 make & model, it was running well, and then after using this in the oil, some time later my car broke down with a strong smell coming from it. It turned out that the oil distributor had actually corroded at the seal and started leaking, when this is supposed to seal leaks in the system. My mechanic ended up having to install a kind of system bypass, because the supplier could not provide a replacement oil system and seal. It ended up costing about a grand for the repairs and cleanup. I bought this to take better care of my car and lubricate it better, but the product seemed to have actually damaged my car to the point that it needed serious repairs and modifications. It should have left it running better than ever, but instead it caused a serious breakdown, and it was by sheer luck that I was able to get it started and leave it with the mechanic. It might work better with your car, but I think given the chain of events, and the amount of time that it had to prevent exactly the problem that occurred, it is fair to say that you might do better taking it for an oil change and getting the additive put in by a professional.

Not yet used but have done my studies ....Must be good & Genuine product

Notable improvement on my older camper van engine. Oil pressure definitely maintains better when hot compared to without. The stuff is pretty thick, I warmed it up before I opened it and it was still pretty slow flowing….

Good

Like this product. Never had a bad one. I had a problem with the engine

I works like a charm. Excellent product!