Engine oil PENNZOIL or IDEMITSU

SP certified oils have better LSPI protection than SN, and SP is what Subaru requires for this generation.

I buy 5 OE Toyota filters at a time from Amazon ( approximately $6 ea ) Purchase Ow-20 Idemitsu oil from NAPA ( ships free to my home ) in the cost saving 6gal box ( 24 qts ) for about $125 with their online coupon. Use this in both my Avalon and my Tundra- both run like a dream.

I use PUP 0w20 in mine. Lots of tests and UOA show that Pennzoil Ultra Platinum is the best non-boutique oil you can buy. But honestly any top shelf oil will work. 5k km intervals are more important than brand with a turbo engine.

Do her a favor a change the oil, with Valvoline Restore and Protect or Pennzoil Ultra platinum, it will quite down a little and it would be great for the car.

Pennzoil Platinum Synthetic. My 1988 740 has near excellent compression at 245k og miles.

At the very least, make sure you're using quality oil like Mobil or Castrol or Pennzoil.

I use Pennzoil Platinum 5W-30 in my 2011 328ix (N51) I believe that is the recommended viscosity.

I use 5w-30 pennzoil ultra platinum full synthetic with the oem motor craft oil filter

I change my oil every 3k miles

So if you review the virgin oil analysis database, it includes idemitsu 0w-20 and 5w-30 and for both, the TBN is rather weak in comparison to other more readily available blends, also, the viscosity at 9.5 cSt for a 30w, some 20w come close to that. Does any of that matter? Not a whole lot, but it shows that there's nothing special about the oil. Generally speaking, higher TBN is better.

BMW switched from Castrol to Penzoil years ago...but both cause oil starvation in The S65 motor