There is also a product called Chassis Ears that will let you listen to the front end as you drive and test. Works great and a lot easier to find than a rolling road

You should definitely shop around. Full synthetic Mobil1 0W-40, 5 quart jug is $37. So the oil plus filter should only run you $78. That's all in US dollars. I don't know how much it will fun where you are, but Amazon should be pretty universal.

Details, maybe uys time for a lawnmower with a straight 4 engine :) I'm not about to spend money on this, but it's a fun thought

Never a good thing to say things like "strap a blower on your lawn mower"... You never know... I'm smiling just thinking about doing that.. :) A pointless waste of money, but so much fun to make it work.. And probably blow past the rings and pop the engine in the process, but details, details.