volvo 240 seals/oil

I changed the engine oil. The new oil is: Castrol gtx 15w40 High Mileage
oil.

Someone said to me that it´s not wise to use that kind of oil, because the
"seal conditioner" in the oil will ruin all the (new) seals. (at this
moment my car is not leaking anywhere). Is this true? Do i have to renew the
oil immediately?

Volo 240 1993 350.000km

 

I don't know for sure, but if an oil would ruin new seals then it would
(further) ruin old seals too. The material from which the seals are
made would be the same either way, and any destructive effect would
therefore be the same.

 

"Tim McNamara" : The material from which the seals are

Ik think the effect will be that because of the "seal conditioner" ,the old
seals will swell up and will give a positive effect (maybe stop leaking).
New seals(or seals which are in a good condition) will also swell up and
will lead to a negative effect (maybe starting leaking). In other words: it
will solve a problem and cause a problem.

 

Maybe. I am skeptical of such claims, perhaps because being a US
citizen I am subjected to specious product claims throughout my waking
hours- the right of companies to mislead about their products being
better protected by our laws than the right of consumers to have
accurate information.

The Castrol page for the product focuses on resistance to burn off and
little information on the seal conditioners, although I did not have
time to read the linked information about the product. I'm going out
for a bike ride, it's a beautiful if unseasonably chilly day. Cars can
wait. If you're interested, there may be more pertinent information in
the links towards the bottom of the page:

<http://www.castrol.com/castrol/genericarticle.do?categoryId=82915476&con
tentId=7034438>

 

no you don't need to switch just one batch of oil; it's not that big
of a difference.

 

Why did you change to 15w40 high milage oil. What improvements are
you expecting.