Should I try one of those "High Mileage" motor oils for my van?

I have a very limited understanding of the subject, but my understanding is that the only difference with the high mileage oils is that they contain additives that condition the seals to prevent leaks. I think this would be very beneficial with a very high mileage car such as yours. On the other hand, even though you've got lots of miles you it's really not all that old, so it may not be necessary. Sorry I'm not much help.

 

I have a very limited understanding of the subject, but my understanding is that the only difference with the high mileage oils is that they contain additives that condition the seals to prevent leaks. I think this would be very beneficial with a very high mileage car such as yours. On the other hand, even though you've got lots of miles you it's really not all that old, so it may not be necessary. Sorry I'm not much help.

 

Oil is not a magical mechanic in a bottle. It does not "fix" anything. Special additives may add an additional barrier against leaks in certain conditions but these are temporary and will not last if you stop using that kind of oil.

 

Oil is not a magical mechanic in a bottle. It does not "fix" anything. Special additives may add an additional barrier against leaks in certain conditions but these are temporary and will not last if you stop using that kind of oil.

 

Seals on that #2 are probably gone. Go to a mechanic and ask for an estimate, then if it worth it to you, get him to take a look. You have to make a decision whether you want to keep the car or not, additives are not going to make the problem go away. Considering the age of the van, I would get the engine fixed (or replaced). If you get that many miles on your car, I suggest you start using fully synthetic oil on your car(s). Fully synthetic, not mineral oil based or mixes (so no Castrol).

If you are going with the engine repair, switch to synthetic now. It might expose additional leaking seals but that's all good.

 

Seals on that #2 are probably gone. Go to a mechanic and ask for an estimate, then if it worth it to you, get him to take a look. You have to make a decision whether you want to keep the car or not, additives are not going to make the problem go away. Considering the age of the van, I would get the engine fixed (or replaced). If you get that many miles on your car, I suggest you start using fully synthetic oil on your car(s). Fully synthetic, not mineral oil based or mixes (so no Castrol).

If you are going with the engine repair, switch to synthetic now. It might expose additional leaking seals but that's all good.

 

I agree with the above comment about synthetic oil, but some people say it doesn't do any good to switch over this late. I recently switched over to full synthetic on my 75,000 mile dodge intrepid. It hasn't been long enough to notice any differences, but I plan to stick with it. You may be interested in a new product from Valvoline: they are now offering their High Mileage in a full synthetic. To my knowledge this is the only full synthetic that contains the seal conditioners.

 

I agree with the above comment about synthetic oil, but some people say it doesn't do any good to switch over this late. I recently switched over to full synthetic on my 75,000 mile dodge intrepid. It hasn't been long enough to notice any differences, but I plan to stick with it. You may be interested in a new product from Valvoline: they are now offering their High Mileage in a full synthetic. To my knowledge this is the only full synthetic that contains the seal conditioners.

 

There really isn't a too late time to start using synthetic. You might get leaks but that is just discovering a problem, not causing it. Better protection and the cost isn't any higher than on mineral oil as you can go much longer without an oil change. I do it every 6000 miles but could probably go longer. Newer cars (with bigger oil filter I assume) have much longer change intervals on synthetic oil, like 15000 miles.

Especially important to use synthetic if you live in cold climate.

 

There really isn't a too late time to start using synthetic. You might get leaks but that is just discovering a problem, not causing it. Better protection and the cost isn't any higher than on mineral oil as you can go much longer without an oil change. I do it every 6000 miles but could probably go longer. Newer cars (with bigger oil filter I assume) have much longer change intervals on synthetic oil, like 15000 miles.

Especially important to use synthetic if you live in cold climate.

 

On the other hand, that seal might still be in (very) good shape if you had used synthetic...

Like I said, it doesn't hurt as the cost versus mineral is about the same.

 

On the other hand, that seal might still be in (very) good shape if you had used synthetic...

Like I said, it doesn't hurt as the cost versus mineral is about the same.

 

If the problem is rings, the conditioners in the high mileage oil won't help you. If it's valve seals, maybe.

Have you tried running a hotter plug? A hotter plug will help prevent the oil fouling, or at least prolong the time it takes to foul. Take whatever plug you're currently using to the parts store. Any good parts counter guy will be able to tell what heat range is one hotter from that one.

-Dave

 

If the problem is rings, the conditioners in the high mileage oil won't help you. If it's valve seals, maybe.

Have you tried running a hotter plug? A hotter plug will help prevent the oil fouling, or at least prolong the time it takes to foul. Take whatever plug you're currently using to the parts store. Any good parts counter guy will be able to tell what heat range is one hotter from that one.

-Dave