Oil for high mileage Nissan Pathfinder

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I have a 1994 Nissan Pathfinder that I've owned for over 10 years. It currently has 447,000km (275~k miles) on the original motor. But recently I've noticed on trips through hilly areas where I have to gear down and rev the motor high to maintain speed, it will use oil. Not a lot, but 1/2 to 1 quart every 1500km deepening on the load. I've gotten used to just slowing down and it is fine, just like my normal city driving. I know it's probably just wear, but I'm wondering if I should step up the oil viscosity? Still running the OE spec'd 5w30, usually Pennzoil. I do all my own work but I am by no means an oil expert. All gaskets have been replaced at some point and there are no leaks, so I don't think high mileage oil will help, right? And no I won't put lucas in it! lol
 
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High mileage oil will help keep ageing seals flexible so they won't <span style="font-weight: bold">begin</span> to look. If those seals are older than 6 years and/or 80,000 miles, then you really should be using a High Mileage Oil. 5w30 is fine. Valvoline MaxLife would be my pick.
 

admzn

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Originally Posted By: oil_film_movies
High mileage oil will help keep ageing seals flexible so they won't begin to look. If those seals are older than 6 years and/or 80,000 miles, then you really should be using a High Mileage Oil. 5w30 is fine. Valvoline MaxLife would be my pick.
They are quite new, I changed the oil pan gasket in the spring. And the rear main seal 2 years ago. Camshaft/front crank was done at last timing belt interval, as were the valve cover gaskets. About 4 years. Nothing leaks at all externally. I will try and find some maxlife, I wish Canadian tire carried Valvoline. Walmart here seems to be a [censored] shoot as to whether it is in stock. I haven't seen chevron here either. I sent off an oil analysis from the last change and I'm really curious as to the results. Will certainly post here! Thank you everyone for your input. Love this site.
 
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Originally Posted By: AdamZ
Originally Posted By: oil_film_movies
High mileage oil will help keep ageing seals flexible so they won't begin to leak. If those seals are older than 6 years and/or 80,000 miles, then you really should be using a High Mileage Oil. 5w30 is fine. Valvoline MaxLife would be my pick.
They are quite new, I changed the oil pan gasket in the spring. And the rear main seal 2 years ago. Camshaft/front crank was done at last timing belt interval, as were the valve cover gaskets. About 4 years. Nothing leaks at all externally.
Those seals are so new, a High Mileage oil is not necessary. It won't hurt, but a normal oil is all you need. On an older vehicle like that, I'd try one of the 0w40 (very stout) oils on the shelf at walmart for about $25 per 5-quart jug. Any 0w40 you see will do great. It could slow down or halt the oil usage, and you can leave that stuff in for a year or 10k miles at a time, its that good.
 
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Dittos on the Valvoline Maxlife oil. It would be a good idea to check your pcv valve too.
 

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So the Walmart near me had no stock of the max life, so I went with the mobil 1 0w40. I also replaced the PCV valve. I think the one in there was the original, it had the Nissan logo on it! Used an aftermarket which makes me weary, hopefully it is fine. I also forgot to mention, I added an oil filter relocation kit. Since I have headers it is hard to squeeze the filter through there. Running the XG8A filter, oil capacity has gone from the stock 3.6L to almost 5L.
 
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Originally Posted By: AdamZ
Used an aftermarket which makes me weary, hopefully it is fine.
Hopefully made by a company you've at least heard of before like Fram, etc. Otherwise replace it again now or after a very short interval.
 

admzn

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It was a Fram. Normally for stuff like this I always hit up the dealer. Surprisingly for a 23 year old vehicle they have a lot available.
 
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