the best oil is what the manufacturer states in literature - PERIOD*.
Do you think you will win a claim if you change oil once a year?...
- no codes, fuel pressure ok, no exhaust restriction, data good, FT,s, TPS, MAP - were good
A thought may fuel tank is not...
Then with scanner look at
Fuel Trims's maybe a failing pump.
Restriction in exhaust - MAP- holding @1500 a restriction...
Easy way to check is to take front shaft out and then drive it
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