Originally Posted By: HTSS_TR
I used Peak 5W30 in LS400 and 10W30 in S2000 last year, I had FAR 20 quarts Peak along with Proline oil filter from Pep Boys. Before Peak those cars had Valvoline Deposit Shield and Chevron Supreme, I did not feel any difference between Peak and Valvoline or Chevron. I think it's as good as any conventional oil for reasonable OCI.
I too bought some PEAK 5W30 w/ProLine filters from PepBoys, FAR in Sept.'09 right after my daughter bought her '06 Mazda3 in Aug.'09. Because I used other oils in her car for winter time(VWB, GTX, HavDS 5W20/PuroClassic), I just finished the last of the 30 quarts/6 ProLine Filters on this last OCI.
I must say that the Peak oil is performing fine. Makes the engine quiet/smooth w/good MPG for ~4.5-5K OCI's. Nothing wrong here!