Hello Owner: If you think a car needs a new part, like a radiator, if the customer can find a cheaper one then what you charge, will you install it?

I cannot speak for the owner, but most shops prefer not to do that. There are expenses involved in supplying parts. Reputable shops like westside offer warranties on parts and labor. They cannot really afford to do that if they are not making some money on the part. Additionally, most shops are familiar and comfortable with particular product lines and vendors. They might be able to sell a cheaper part but prefer not to because of the increased likelihood of a comeback or rerepair. I think you will find that most shops prefer not to use customer supplied parts but you can always call and ask. Hope this helps.

I have bought my own oil and filter and they had no problem using it.