vs2306

Topped up my IS250 with mostly 10W30, but that wasn't enough. So I used a little bit on Castrol Magnatec 10W40. I know mixing oils is best avoided, but is this ok for the time being?

Hoping to get my car serviced with my local mechanic, I believe he stocks Magnatec 5W30, not sure if he has 10W30 like the dealership.

Got the following quotes a week ago.

Brighton Lexus - $938

Ultratune (Using Genuine Parts + Labour included) - $365:

Oil: Castrol Magnatec 10W30 (Same spec as Lexus engine oil)

Oil Filter: Genuine Lexus

Fuel Filter: Genuine Lexus

Got the following quotes a week ago.

Brighton Lexus - $938

Ultratune (Using Genuine Parts + Labour included) - $365:

Oil: Castrol Magnatec 10W30 (Same spec as lexus)

Oil Filter: Genuine Lexus

Fuel Filter: Genuine Lexus

Is the IS250 a relatively easy car to work on? Like a Toyota. Or are they as complex like its European competitors?