I just sold my 2004 V70R which I kept on a steady diet of Amsoil 5W30 and GC 0W30. A few weeks ago I bought (at a terrific price) a new 2009 M35 RWD (3.5 L V6 w/ 7spd AT). To keep up the warranty Infiniti requires OCI of 3,750 (which for me should be about every 5-6 mos.). I plan on using only synthetic oil. Unfortunately the SA at the dealership balked at extending the OCI or using 0W30 oil rather than recommended 5W30 (the owners manual is quite explicit on this). I have enough left over Amsoil (ASL) 5W30 for one oil change (which I will use for one of the OC in the next year or two) but I can't rationalize using buying more oil of this quality and cost for this short a OCI. My main alternatives right now are 1) Penzoil Platinum $20/5qt 2) Mobil 1 5W30 at $22/5 qt. I know both of these are primarily group III synthetics but I think for this OCI either of them should easily hold up and yet keep the new engine a bit cleaner than dino.
Any thoughts or suggestions on what synthetic I should use to keep this engine in tip top shape and during the warranty period?
Any thoughts or suggestions on what synthetic I should use to keep this engine in tip top shape and during the warranty period?