i've been using Mobile 1 in everything for the last twenty plus years or whenever they started making it.
Nothing has ever failed or smoked and i drive the pants off everything all the time.
Motorcycles, race boats, vettes, cobs, trucks and smowmobiles.
Everything that is, except aircraft. A friend of mine at Lycoming suggested avoiding the Mobil 1 they prepared for aviation about ten years or so until there was a clear field experience that said it was OK. He was a very older guy that started on OX-5's, ran P & W radials during the WWII and is very careful.
He gave me good advice. Aviation Mobile 1 was a complete and abject failure. Mobile paid for the overhaul of many dozens of engines at $15K to $30K a pop to settle their potential lawsuits from the damages caused by the
oil. At least, Mobile did step up to the plate and pay.
So, before i took the plunge on this
oil for a semi-street engine, i would wait a bit and look for results.
Street is not race.