Some oil experiences with some of the vehicles I've owned:
1. Chrysler Dodge minivan, 330,000 miles - Mobil 1 for its life - no engine problem. OCI - 10 to 12K miles
2. Lexus RX300, 310,000 miles - Amsoil Signature series, no engine problems. OCI - 10K miles
3. Jaguar XJ6 120,000 miles - Mobil 1 15W50, no engine problems. OCI - yearly (~4-5K/yr)
4. 2008 Audi A4 MT, 95,000 miles - Amsoil 5W-40 European formula, no problems, runs strong. OCI - 7K miles
5. Honda CB750, 98,000 miles - Mobil 1, no engine problems. OCI - 3K miles
6. BMW R1200RT, 72,000 miles - Amsoil 20W-50, runs like new. OCI - 5K miles
7. 1980 Kubota 3 cyl diesel tractor, 1500 hr - Rotella T6 15W-40 to 2005, Amsoil 15W-40 thereafter, runs like new. OCI - 100hr
8. All other lawn and garden equip. runs on Amsoil 10W-30 with annual oil change - never an engine problem.
I know this is much more info than you asked for but will share anyway.
I no longer own the minivan, Lexus, or CB750. While I use Amsoil now and Mobil 1 in the past I seriously doubt there are any significant or noteworthy differences between the premium synthetic motor oils on the market today. I used to do engine oil analysis at Blackstone Labs but they were always unremarkable for all indications. I have EOA on all vehicles and Kubota (not on yard equip.) to be used as a baseline should I ever need them. I still do EOA on the piston powered aircraft I own as these are engine critical applications but that is outside the purview of this discussion.
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