Engine oil Castrol or MOTUL

5w40 VW 502 spec. Audi recommends Castrol so that's what I use.

The one that seems to have made the greatest difference (non-tracking) is the one referenced below in either 5w50, 5w40, or the two of them mixed together. Per the relevant gauges, the 996 runs a bit cooler and the viscosity (via oil pressure readings across running temperatures and times) stays higher.

Personally i never run ”GM” oil in my 95s anymore. I usually run Castrol edge 0-40

OEM oil is made by cheapest bidder who was able to fill the minimum requirements by the already cheapskate GM.

my 2 cents - use MOTUL DEXOS 2 SPECIFIC. Or some other premium oil. Oil is the most important fluid your car has. Cheaping out on it just stupid.

My car at 150k extensively used Shell 10w60, and I switched it to Motul 10w60 cause it was the easiest to get for me.

I just changed the oil in my MK7 GTI (around 300hp) with MOTUL X-cess (5w40) and my god did it ever make a difference!

I ran this in my mk7 and my brother ran Castrol Edge Euro in his mk7. I have since sold mine but neither one of us had any type of engine/oil consumption issue and he still has with 130k on it.

Buy filters in bulk from RockAuto. Buy oil Castrol Euro Car from Walmart when it’s in sale.

4100 turbo light? It isn't JASO MA specified for motorcycles and wet clutches. No damage from oil. Probably just rough gear changing and maybe rough on the clutch plates but you should be fine.

HP Prolube is a very low quality oil compared to other oil brands in the market. Castrol has good head sound dampening, as does Rowe, both great for gear shifts and clutch feel.