|
So my Prius oil finally 'failed' the test - scored a 10 after 12 months and 3,000 miles. It seems the oil tester isn't really linear, the oil sat on 7-8 for a long time, but then basically skipped the 9 and straight to 10. It was dealer oil so I don't know what was in it. Refilled with semi-synth 5W-40 as that's what I had and have no other use for.
The car's being sold so I won't be able to report any more long term monitoring. All other cars including the F1 still scored 1 or 2.
|