Buying OIL and Filter in Canada

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Hi all, I just called the dealer go have filter and oil for my 99 Boxster, 30$ filter (only the cartridge no housing) and 10$/L for some 540 Syn recomanded oil (total something, Blend from Europe). I am sure I could have these stuff cheaper than the dealer. Any suggestion in Canada?

I found an oil list here : http://kiyor32.cocolog-nifty.com/gt3/Approved-Oil-List-2006.pdf
I wonder If I could just call car parts around the town to see if they can find me oil and filter?

what do you think?

Thanks


P.S. I am sure this subject been plenty covered in the past, but I din't find any thead about finding it with resonable price in canada..